commit a16b90e1816f550af13c9276dd60bf5cfc1ca104
Author: MarcUs7i <96580944+MarcUs7i@users.noreply.github.com>
Date:   Sat May 24 01:03:16 2025 +0200

    Initial Commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..df1ac3a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,184 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+# Visual Studio Code
+#  Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore 
+#  that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore
+#  and can be added to the global gitignore or merged into this file. However, if you prefer, 
+#  you could uncomment the following to ignore the enitre vscode folder
+# .vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Library testing stuff
+test-lib.py
\ No newline at end of file
diff --git a/LidlConnect/__init__.py b/LidlConnect/__init__.py
new file mode 100644
index 0000000..16f005e
--- /dev/null
+++ b/LidlConnect/__init__.py
@@ -0,0 +1,5 @@
+"""Lidl Connect API client library."""
+
+from .client import LidlConnect
+
+__all__ = ["LidlConnect"]
\ No newline at end of file
diff --git a/LidlConnect/api/__init__.py b/LidlConnect/api/__init__.py
new file mode 100644
index 0000000..7f59b81
--- /dev/null
+++ b/LidlConnect/api/__init__.py
@@ -0,0 +1 @@
+"""API modules for Lidl Connect."""
\ No newline at end of file
diff --git a/LidlConnect/api/invoices.py b/LidlConnect/api/invoices.py
new file mode 100644
index 0000000..d1bf123
--- /dev/null
+++ b/LidlConnect/api/invoices.py
@@ -0,0 +1,173 @@
+"""Invoices-related API functionality for Lidl Connect."""
+
+from typing import Dict, Any, List, Optional
+from datetime import datetime
+from ..helpers import ttl_cache
+
+class InvoicesMixin:
+    """Invoices-related API methods for Lidl Connect API."""
+    
+    INVOICES_URL = "https://selfcare.lidl-connect.at/customer/invoices/invoice-list"
+    VOUCHER_URL = "https://selfcare.lidl-connect.at/customer/invoices/consumed-vouchers"
+    
+    @ttl_cache(30)
+    def get_invoices(self) -> List[Dict[str, Any]]:
+        """
+        Get list of invoices for the current account.
+        
+        Returns:
+            List[Dict]: List of invoice objects with transaction details
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+        
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+            "ocrAvailable": "0",
+        }
+        
+        payload = {"accountId": self.endpoint_id, "userId": self.user_id, "endpointId": self.endpoint_id}
+        r = self.session.post(self.INVOICES_URL, headers=headers, json=payload)
+        
+        if r.status_code != 200:
+            if r.status_code == 422 and r.text == '[]':
+                return []
+            raise ValueError(f"Invoices request failed: {r.status_code} {r.text!r}")
+        
+        return r.json()
+    
+    @ttl_cache(30)
+    def get_vouchers(self) -> List[Dict[str, Any]]:
+        """
+        Get list of consumed vouchers for the current account.
+        
+        Returns:
+            List[Dict]: List of voucher objects with transaction details
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+        
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+            "ocrAvailable": "0",
+        }
+        
+        payload = {"userId": self.user_id, "endpointId": self.endpoint_id}
+        r = self.session.post(self.VOUCHER_URL, headers=headers, json=payload)
+        
+        if r.status_code != 200:
+            if r.status_code == 422 and r.text == '[]':
+                return []
+            raise ValueError(f"Vouchers request failed: {r.status_code} {r.text!r}")
+        
+        return r.json()
+    
+    def print_invoices(self) -> None:
+        """
+        Pretty-print invoice and voucher history.
+        """
+        try:
+            invoices = self.get_invoices()
+            vouchers = self.get_vouchers()
+            
+            if not invoices and not vouchers:
+                print("\nNo payment history available")
+                return
+                
+            if invoices:
+                print(f"\n{'=' * 20} INVOICE HISTORY {'=' * 20}")
+                
+                for invoice in invoices:
+                    try:
+                        posting_date = datetime.fromisoformat(invoice.get("postingDate").replace("Z", "+00:00"))
+                        date_str = posting_date.strftime("%d %b %Y, %H:%M")
+                    except (ValueError, AttributeError):
+                        date_str = invoice.get("postingDate", "Unknown date")
+                    
+                    payment_type = invoice.get("type", "").capitalize()
+                    provider = invoice.get("provider", "")
+                    channel = invoice.get("channel", "").replace("_", " ").title()
+                    payment_method = f"{payment_type} via {provider} ({channel})"
+                    
+                    print(f"\n{'-' * 60}")
+                    print(f"Transaction ID: {invoice.get('id')}")
+                    print(f"Date: {date_str}")
+                    print(f"Amount: €{invoice.get('amount', 0):.2f}")
+                    print(f"Payment Method: {payment_method}")
+            
+            if vouchers:
+                print(f"\n{'=' * 20} VOUCHER HISTORY {'=' * 20}")
+                
+                for voucher in vouchers:
+                    try:
+                        posting_date = datetime.fromisoformat(voucher.get("consumedDate").replace("Z", "+00:00"))
+                        date_str = posting_date.strftime("%d %b %Y, %H:%M")
+                    except (ValueError, AttributeError):
+                        date_str = voucher.get("consumedDate", "Unknown date")
+                    
+                    print(f"\n{'-' * 60}")
+                    print(f"Voucher ID: {voucher.get('id')}")
+                    print(f"Serial: {voucher.get('serial')}")
+                    print(f"Value: €{voucher.get('balanceAdvice', 0):.2f}")
+                    print(f"Consumed Date: {date_str}")
+        except Exception as e:
+            print(f"\nError fetching payment history: {str(e)}")
+            import traceback
+            traceback.print_exc()
+    
+    def get_total_spent(self) -> float:
+        """
+        Calculate the total amount spent across all invoices and vouchers.
+        
+        Returns:
+            float: Total amount in euros
+        """
+        total = 0.0
+        try:
+            invoices = self.get_invoices()
+            vouchers = self.get_vouchers()
+            total += sum(invoice.get("amount", 0) for invoice in invoices)
+            total += sum(voucher.get("balanceAdvice", 0) for voucher in vouchers)
+        except Exception:
+            pass
+        return total
+    
+    @property
+    def last_payment_date(self) -> Optional[str]:
+        """
+        Get the date of the most recent payment from either invoices or vouchers.
+        
+        Returns:
+            str: ISO formatted date string or None if no payments
+        """
+        try:
+            all_dates = []
+            
+            invoices = self.get_invoices()
+            invoice_dates = [(invoice.get("postingDate"), invoice.get("amount")) 
+                             for invoice in invoices if invoice.get("postingDate")]
+            
+            vouchers = self.get_vouchers()
+            voucher_dates = [(voucher.get("consumedDate"), voucher.get("balanceAdvice")) 
+                            for voucher in vouchers if voucher.get("consumedDate")]
+            
+            all_dates = invoice_dates + voucher_dates
+            if not all_dates:
+                return None
+                
+            all_dates.sort(key=lambda x: x[0], reverse=True)
+            return all_dates[0][0]
+        except Exception:
+            return None
\ No newline at end of file
diff --git a/LidlConnect/api/tariffs.py b/LidlConnect/api/tariffs.py
new file mode 100644
index 0000000..ddf4b0f
--- /dev/null
+++ b/LidlConnect/api/tariffs.py
@@ -0,0 +1,138 @@
+"""Tariffs-related API functionality for Lidl Connect."""
+
+from typing import Dict, Any, List
+from ..helpers import ttl_cache
+
+class TariffsMixin:
+    """Tariffs-related API methods for Lidl Connect API."""
+    
+    TARIFFS_URL = "https://selfcare.lidl-connect.at/customer/tariffs/all-packages"
+    
+    @ttl_cache(60)
+    def get_tariffs(self) -> List[Dict[str, Any]]:
+        """
+        Get all available tariffs for the current account.
+        
+        Returns:
+            List[Dict]: List of tariff objects with relevant information
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+        
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+        }
+        
+        payload = {"userId": self.user_id, "endpointId": self.endpoint_id}
+        r = self.session.post(self.TARIFFS_URL, headers=headers, json=payload)
+        
+        if r.status_code != 200:
+            raise ValueError(f"Tariffs request failed: {r.status_code} {r.text!r}")
+        
+        data = r.json()
+        tariffs = [item for item in data if item.get("category") == "TARIFF"]
+        
+        result = []
+        for tariff in tariffs:
+            processed_tariff = {
+                "id": tariff.get("id"),
+                "itemId": tariff.get("itemId"),
+                "name": tariff.get("name"),
+                "description": tariff.get("description"),
+                "sort": tariff.get("sort", 0),
+                "featured": tariff.get("featured", False),
+                "visible": tariff.get("visible", True),
+            }
+            
+            translations = tariff.get("translations")
+            if translations and isinstance(translations, dict):
+                german_translation = translations.get("de", {})
+                if german_translation and isinstance(german_translation, dict):
+                    processed_tariff["german_name"] = german_translation.get("name")
+                    processed_tariff["german_content"] = german_translation.get("content")
+                    processed_tariff["german_teaser"] = german_translation.get("teaser")
+            
+            result.append(processed_tariff)
+        
+        result.sort(key=lambda x: x.get("sort", 0))
+        return result
+    
+    def print_tariffs(self) -> None:
+        """
+        Pretty-print available tariffs.
+        """
+        try:
+            tariffs = self.get_tariffs()
+            
+            if not tariffs:
+                print("\nNo tariff information available")
+                return
+                
+            print(f"\n{'=' * 20} AVAILABLE TARIFFS {'=' * 20}")
+            for tariff in tariffs:
+                print(f"\n{'-' * 60}")
+                print(f"Name: {tariff.get('german_name') or tariff.get('name')}")
+                print(f"ID: {tariff.get('itemId')}")
+                
+                if tariff.get('german_teaser'):
+                    import html
+                    import re
+                    
+                    # HTML entities
+                    teaser = html.unescape(tariff.get('german_teaser'))
+                    
+                    # style attributes
+                    teaser = re.sub(r'style="[^"]*"', '', teaser)
+                    teaser = re.sub(r'class="[^"]*"', '', teaser)
+                    
+                    # table structure
+                    teaser = re.sub(r'<tr[^>]*>', '\n', teaser)
+                    teaser = re.sub(r'<td[^>]*>', ' | ', teaser)
+                    teaser = re.sub(r'</tr>', '', teaser)
+                    teaser = re.sub(r'</td>', '', teaser)
+                    
+                    # line breaks
+                    teaser = teaser.replace('<br>', '\n').replace('<br/>', '\n')
+                    teaser = teaser.replace('<p>', '').replace('</p>', '\n')
+                    
+                    # divs and spans
+                    teaser = re.sub(r'<div[^>]*>', '', teaser)
+                    teaser = re.sub(r'</div>', '', teaser)
+                    teaser = re.sub(r'<span[^>]*>', '', teaser)
+                    teaser = re.sub(r'</span>', '', teaser)
+                    
+                    # other HTML tags
+                    teaser = re.sub(r'<[^>]+>', '', teaser)
+                    
+                    # whitespace and cleanup
+                    teaser = re.sub(r'\s+', ' ', teaser)
+                    teaser = re.sub(r' \| ', ' | ', teaser)
+                    teaser = re.sub(r'\n\s+', '\n', teaser)
+                    
+                    # newlines
+                    teaser = re.sub(r'\n+', '\n', teaser)
+                    
+                    # special chars
+                    teaser = teaser.replace('\\u00a0', ' ')
+                    
+                    # keep only printable ASCII chars
+                    teaser = ''.join([i if ord(i) < 128 else ' ' for i in teaser])
+                    
+                    # other table tags
+                    for tag in ['<table>', '</table>', '<tbody>', '</tbody>']:
+                        teaser = teaser.replace(tag, '')
+                    
+                    print(f"\nDetails:\n{teaser.strip()}")
+                
+                print(f"Featured: {'✓' if tariff.get('featured') else '✗'}")
+                print(f"Visible: {'✓' if tariff.get('visible') else '✗'}")
+        except Exception as e:
+            print(f"\nError fetching tariffs: {str(e)}")
+            import traceback
+            traceback.print_exc()
\ No newline at end of file
diff --git a/LidlConnect/api/usage.py b/LidlConnect/api/usage.py
new file mode 100644
index 0000000..4c88cd5
--- /dev/null
+++ b/LidlConnect/api/usage.py
@@ -0,0 +1,197 @@
+"""Usage-related API functionality for Lidl Connect."""
+
+from typing import Dict, Any, Optional
+from ..helpers import ttl_cache
+
+class UsageMixin:
+    """Usage-related API methods for Lidl Connect."""
+    
+    USAGE_URL = "https://selfcare.lidl-connect.at/customer/usage/"
+    
+    @ttl_cache(5)
+    def get_usage_data(self) -> Dict[str, Any]:
+        """
+        Get usage data for the current account.
+        
+        Returns:
+            Dict: Usage data including instanceGroups with counters
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+        
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+        }
+        payload = {"userId": self.user_id, "endpointId": self.endpoint_id}
+        
+        r = self.session.post(self.USAGE_URL, headers=headers, json=payload)
+        if r.status_code != 200:
+            raise ValueError(f"Usage request failed: {r.status_code} {r.text!r}")
+        
+        return r.json()
+    
+    def print_usage_summary(self, data: Optional[Dict[str, Any]] = None) -> None:
+        """
+        Pretty-print usage summary data.
+        
+        Args:
+            data: Optional usage data. If None, will fetch new data
+        """
+        if data is None:
+            data = self.get_usage_data()
+        
+        for group in data.get("instanceGroups", []):
+            print(f"{group['itemName']} ({group['itemCategory']})")
+            for elem in group.get("instanceElements", []):
+                print(f"  • Valid: {elem['validFrom']} → {elem['validTo']}")
+                for counter in elem.get("counters", []):
+                    nv = counter["niceValue"]
+                    unit = nv.get("type") or counter.get("baseValue", {}).get("type", "")
+                    print(f"    - {counter['counterId']}: {nv['value']} / {nv['initialValue']} {unit}")
+            print()
+    
+    def get_remaining_data(self) -> Dict[str, float]:
+        """
+        Get remaining data balance (in GiB).
+        
+        Returns:
+            Dict with remaining, total, and used data in GiB
+        """
+        data = self.get_usage_data()
+        result = {"remaining": 0, "total": 0, "used": 0}
+        
+        for group in data.get("instanceGroups", []):
+            for elem in group.get("instanceElements", []):
+                for counter in elem.get("counters", []):
+                    if counter["counterId"] == "DATA":
+                        nv = counter["niceValue"]
+                        if nv.get("type") == "GiB":
+                            result["remaining"] = nv["value"]
+                            result["total"] = nv["initialValue"]
+                            result["used"] = nv["initialValue"] - nv["value"]
+        
+        return result
+    
+    def get_remaining_eu_data(self) -> Dict[str, float]:
+        """
+        Get remaining EU data balance (in GiB).
+        
+        Returns:
+            Dict with remaining, total, and used EU data in GiB
+        """
+        data = self.get_usage_data()
+        result = {"remaining": 0, "total": 0, "used": 0}
+        
+        for group in data.get("instanceGroups", []):
+            for elem in group.get("instanceElements", []):
+                for counter in elem.get("counters", []):
+                    if counter["counterId"] == "DATA_EU":
+                        nv = counter["niceValue"]
+                        if nv.get("type") == "GiB":
+                            result["remaining"] = nv["value"]
+                            result["total"] = nv["initialValue"]
+                            result["used"] = nv["initialValue"] - nv["value"]
+        
+        return result
+    
+    def get_remaining_minutes(self) -> Dict[str, float]:
+        """
+        Get remaining voice minutes.
+        
+        Returns:
+            Dict with remaining, total, and used minutes
+        """
+        data = self.get_usage_data()
+        result = {"remaining": 0, "total": 0, "used": 0}
+        
+        for group in data.get("instanceGroups", []):
+            for elem in group.get("instanceElements", []):
+                for counter in elem.get("counters", []):
+                    if counter["counterId"] == "VOICE_SMS":
+                        nv = counter["niceValue"]
+                        if nv.get("type") == "MIN":
+                            result["remaining"] = nv["value"]
+                            result["total"] = nv["initialValue"]
+                            result["used"] = nv["initialValue"] - nv["value"]
+        
+        return result
+    
+    @property
+    def tariff_package_valid_from(self) -> Optional[str]:
+        """
+        Get the start date of the current tariff package.
+        
+        Returns:
+            ISO formatted date string or None if not available
+        """
+        try:
+            data = self.get_usage_data()
+            for group in data.get("instanceGroups", []):
+                if group.get("itemCategory") == "TARIFF_PACKAGE":
+                    for elem in group.get("instanceElements", []):
+                        return elem.get("validFrom")
+            return None
+        except Exception:
+            return None
+    
+    @property
+    def tariff_package_valid_to(self) -> Optional[str]:
+        """
+        Get the end date of the current tariff package.
+        
+        Returns:
+            ISO formatted date string or None if not available
+        """
+        try:
+            data = self.get_usage_data()
+            for group in data.get("instanceGroups", []):
+                if group.get("itemCategory") == "TARIFF_PACKAGE":
+                    for elem in group.get("instanceElements", []):
+                        return elem.get("validTo")
+            return None
+        except Exception:
+            return None
+    
+    @property
+    def tariff_package_details(self) -> Optional[Dict[str, Any]]:
+        """
+        Get detailed information about the current tariff package.
+        
+        Returns:
+            Dict containing name, category, validFrom, validTo and other details
+            or None if not available
+        """
+        try:
+            data = self.get_usage_data()
+            for group in data.get("instanceGroups", []):
+                if group.get("itemCategory") == "TARIFF_PACKAGE":
+                    result = {
+                        "name": group.get("itemName"),
+                        "category": group.get("itemCategory"),
+                    }
+                    
+                    if group.get("instanceElements") and len(group.get("instanceElements")) > 0:
+                        elem = group.get("instanceElements")[0]
+                        result.update({
+                            "validFrom": elem.get("validFrom"),
+                            "validTo": elem.get("validTo"),
+                            "counters": [
+                                {
+                                    "id": counter.get("counterId"),
+                                    "value": counter.get("niceValue", {}).get("value"),
+                                    "initialValue": counter.get("niceValue", {}).get("initialValue"),
+                                    "unit": counter.get("niceValue", {}).get("type")
+                                }
+                                for counter in elem.get("counters", [])
+                            ]
+                        })
+                    return result
+            return None
+        except Exception:
+            return None
\ No newline at end of file
diff --git a/LidlConnect/api/user.py b/LidlConnect/api/user.py
new file mode 100644
index 0000000..fc9ca84
--- /dev/null
+++ b/LidlConnect/api/user.py
@@ -0,0 +1,138 @@
+"""User-related API functionality for Lidl Connect."""
+
+from typing import Dict, Any, Optional
+from ..helpers import ttl_cache
+
+class UserDataMixin:
+    """User data methods for Lidl Connect API."""
+    
+    USER_DATA_URL = "https://selfcare.lidl-connect.at/customer/dashboard/login-check"
+    
+    @ttl_cache(30)
+    def _get_user_data(self) -> Dict[str, Any]:
+        """
+        Get user data from the server.
+        
+        Returns:
+            Dict: User data including name, type, accounts, etc.
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+        
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+        }
+        
+        payload = {"userId": self.user_id, "endpointId": self.endpoint_id}
+        r = self.session.post(self.USER_DATA_URL, headers=headers, json=payload)
+        
+        if r.status_code != 200:
+            raise ValueError(f"User data request failed: {r.status_code} {r.text!r}")
+        
+        return r.json()
+    
+    @property
+    def user_name(self) -> Optional[str]:
+        """Get user's name."""
+        try:
+            return self._get_user_data().get("name")
+        except Exception:
+            return None
+    
+    @property
+    def user_type(self) -> Optional[str]:
+        """Get user's type (e.g., 'CUSTOMER')."""
+        try:
+            return self._get_user_data().get("userType")
+        except Exception:
+            return None
+    
+    @property
+    def has_password(self) -> bool:
+        """Check if user has set a password."""
+        try:
+            return self._get_user_data().get("hasPassword", False)
+        except Exception:
+            return False
+    
+    @property
+    def birth_date(self) -> Optional[str]:
+        """Get user's birth date."""
+        try:
+            return self._get_user_data().get("birthDate")
+        except Exception:
+            return None
+    
+    @property
+    def status(self) -> Optional[str]:
+        """Get endpoint status (e.g., 'ACTIVE')."""
+        try:
+            data = self._get_user_data()
+            for account in data.get("accounts", []):
+                for endpoint in account.get("endpoints", []):
+                    if endpoint.get("id") == self.endpoint_id:
+                        return endpoint.get("status")
+            return None
+        except Exception:
+            return None
+    
+    @property
+    def customer_type(self) -> Optional[str]:
+        """Get customer type (e.g., 'ANONYM')."""
+        try:
+            return self._get_user_data().get("customerType")
+        except Exception:
+            return None
+    
+    @property
+    def customer_language(self) -> Optional[str]:
+        """Get customer language preference."""
+        try:
+            return self._get_user_data().get("customerLanguage")
+        except Exception:
+            return None
+    
+    @property
+    def balance(self) -> Optional[float]:
+        """Get account balance."""
+        try:
+            data = self._get_user_data()
+            for account in data.get("accounts", []):
+                for endpoint in account.get("endpoints", []):
+                    if endpoint.get("id") == self.endpoint_id:
+                        return endpoint.get("ocsBalance")
+            return None
+        except Exception:
+            return None
+            
+    @property
+    def activation_date(self) -> Optional[str]:
+        """Get activation date."""
+        try:
+            data = self._get_user_data()
+            for account in data.get("accounts", []):
+                for endpoint in account.get("endpoints", []):
+                    if endpoint.get("id") == self.endpoint_id:
+                        return endpoint.get("activationDate")
+            return None
+        except Exception:
+            return None
+            
+    @property
+    def deactivation_date(self) -> Optional[str]:
+        """Get deactivation date."""
+        try:
+            data = self._get_user_data()
+            for account in data.get("accounts", []):
+                for endpoint in account.get("endpoints", []):
+                    if endpoint.get("id") == self.endpoint_id:
+                        return endpoint.get("deactivationDate")
+            return None
+        except Exception:
+            return None
\ No newline at end of file
diff --git a/LidlConnect/api/utils.py b/LidlConnect/api/utils.py
new file mode 100644
index 0000000..b5c8abb
--- /dev/null
+++ b/LidlConnect/api/utils.py
@@ -0,0 +1,41 @@
+"""Utility functionality for Lidl Connect API."""
+
+from typing import Dict, Any, Union
+
+class ApiMixin:
+    """General API utilities for Lidl Connect."""
+    
+    def make_api_request(self, url: str, data: Dict = None, method: str = "POST") -> Union[Dict[str, Any], str]:
+        """
+        Make a generic API request to Lidl Connect.
+        
+        Args:
+            url: API endpoint to call
+            data: Payload to send (optional)
+            method: HTTP method (default: POST)
+            
+        Returns:
+            Dict or str: API response (JSON parsed if Content-Type is application/json)
+        """
+        if not self.logged_in or not self.csrf_token:
+            raise ValueError("Not logged in or missing CSRF token")
+            
+        headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=UTF-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": self.DASHBOARD_URL,
+            "X-CSRF-TOKEN": self.csrf_token,
+            "X-SELF-CARE": "1",
+        }
+        
+        if method.upper() == "POST":
+            r = self.session.post(url, headers=headers, json=data or {})
+        else:
+            r = self.session.get(url, headers=headers)
+            
+        if r.status_code >= 400:
+            raise ValueError(f"API request failed: {r.status_code} {r.text!r}")
+            
+        return r.json() if r.headers.get('Content-Type') == 'application/json' else r.text
\ No newline at end of file
diff --git a/LidlConnect/auth.py b/LidlConnect/auth.py
new file mode 100644
index 0000000..dcf13c7
--- /dev/null
+++ b/LidlConnect/auth.py
@@ -0,0 +1,56 @@
+"""Authentication-related functionality for Lidl Connect."""
+
+from typing import Dict
+
+class AuthMixin:
+    """Authentication methods for Lidl Connect API."""
+    
+    LOGIN_PUK_URL = "https://selfcare.lidl-connect.at/de/customer/login/puk"
+    LOGIN_PASSWORD_URL = "https://selfcare.lidl-connect.at/de/customer/login/account"
+    LOGOUT_URL = "https://selfcare.lidl-connect.at/de/customer/logout"
+    
+    @property
+    def login_url(self):
+        """Get the appropriate login URL based on credentials."""
+        return self.LOGIN_PUK_URL if self.puk else self.LOGIN_PASSWORD_URL
+    
+    def login(self) -> bool:
+        """
+        Log in to Lidl Connect.
+        
+        Returns:
+            bool: True if login successful
+        """
+        login_headers = {
+            "Accept": "application/json",
+            "Content-Type": "application/json;charset=utf-8",
+            "X-Requested-With": "XMLHttpRequest",
+            "Origin": "https://selfcare.lidl-connect.at",
+            "Referer": "https://selfcare.lidl-connect.at/en/customer/login",
+            "X-AUTH-SELF-CARE": "1",
+            "locale": "en",
+        }
+        login_payload = {"identifier": self.identifier, "token": self.token}
+        
+        r = self.session.post(self.login_url, headers=login_headers, json=login_payload)
+        if r.status_code != 200:
+            return False
+        
+        self.logged_in = True
+        return True
+    
+    def logout(self) -> bool:
+        """
+        Log out from Lidl Connect.
+        
+        Returns:
+            bool: True if logout successful, False otherwise
+        """
+        if not self.logged_in:
+            return True
+            
+        r = self.session.get(self.LOGOUT_URL)
+        if r.status_code == 200 or r.status_code == 302:
+            self.logged_in = False
+            return True
+        return False
\ No newline at end of file
diff --git a/LidlConnect/client.py b/LidlConnect/client.py
new file mode 100644
index 0000000..cea6d03
--- /dev/null
+++ b/LidlConnect/client.py
@@ -0,0 +1,84 @@
+"""Main client class for Lidl Connect API."""
+
+import requests
+import signal
+import atexit
+
+from .auth import AuthMixin
+from .extractors import ExtractorMixin
+from .api.usage import UsageMixin
+from .api.utils import ApiMixin
+from .api.user import UserDataMixin
+from .api.tariffs import TariffsMixin
+from .api.invoices import InvoicesMixin
+
+class LidlConnect(AuthMixin, ExtractorMixin, UsageMixin, ApiMixin, UserDataMixin, TariffsMixin, InvoicesMixin):
+    """Client for interacting with Lidl Connect Self-Care portal."""
+    
+    DASHBOARD_URL = "https://selfcare.lidl-connect.at/customer/dashboard/"
+    
+    def __init__(self, identifier: str, puk: str = None, password: str = None):
+        """
+        Initialize Lidl Connect client.
+        
+        Args:
+            identifier: Your phone number or customer ID
+            puk: Your PUK code (optional if password provided)
+            password: Your password (optional if PUK provided)
+        """
+        # Base components
+        self.identifier = identifier
+        self.puk = puk
+        self.password = password
+        self.token = puk if puk else password
+        
+        # Session and tokens
+        self.session = requests.Session()
+        self.csrf_token = None
+        self.endpoint_id = None
+        self.logged_in = False
+        
+        # User data
+        self.user_id = None
+        
+        atexit.register(self._cleanup)
+        signal.signal(signal.SIGINT, self._signal_handler)
+        signal.signal(signal.SIGTERM, self._signal_handler)
+    
+    def _cleanup(self):
+        """Clean up resources and log out when program exits."""
+        if self.logged_in:
+            try:
+                self.logout()
+            except Exception as e:
+                print(f"Error during logout at program shutdown: {e}")
+    
+    def _signal_handler(self, signum, frame):
+        """Handle termination signals to ensure clean logout."""
+        print("\nCaught termination signal. Logging out...")
+        self._cleanup()
+        signal.signal(signum, signal.SIG_DFL)
+        signal.raise_signal(signum)
+    
+    def initialize(self) -> bool:
+        """
+        Initialize the client: login, fetch dashboard, and extract necessary tokens and IDs.
+        
+        Returns:
+            bool: True if initialization successful
+        """
+        if not self.login():
+            return False
+        
+        try:
+            soup = self._fetch_dashboard()
+            self.csrf_token = self._extract_csrf(soup)
+            self.user_id, self.endpoint_id = self._extract_user_and_endpoint(soup)
+            return True
+        except Exception as e:
+            print(f"Error during initialization: {e}")
+            return False
+        
+    def _fetch_dashboard(self):
+        """Fetch dashboard HTML and parse it."""
+        return self._get_soup(self.DASHBOARD_URL)
\ No newline at end of file
diff --git a/LidlConnect/extractors.py b/LidlConnect/extractors.py
new file mode 100644
index 0000000..8e56d50
--- /dev/null
+++ b/LidlConnect/extractors.py
@@ -0,0 +1,39 @@
+"""HTML and data extraction for Lidl Connect API."""
+
+from bs4 import BeautifulSoup
+import re
+from typing import Tuple
+
+class ExtractorMixin:
+    """HTML extraction methods for Lidl Connect API."""
+    
+    def _get_soup(self, url: str) -> BeautifulSoup:
+        """Get BeautifulSoup object from URL."""
+        r = self.session.get(url)
+        return BeautifulSoup(r.text, "html.parser")
+    
+    def _extract_csrf(self, soup: BeautifulSoup) -> str:
+        """Extract CSRF token from dashboard HTML."""
+        meta = soup.find("meta", {"name": "csrf-token"})
+        if not meta or not meta.get("content"):
+            raise ValueError("CSRF token not found in dashboard HTML")
+        return meta["content"]
+    
+    def _extract_user_and_endpoint(self, soup: BeautifulSoup) -> Tuple[int, int]:
+        """Extract user ID and endpoint ID from dashboard HTML."""
+        all_scripts = ""
+        for script in soup.find_all("script"):
+            if script.string:
+                all_scripts += script.string
+
+        user_match = re.search(r"window\.user\s*=\s*\{.*?'user':\s*\{\s*\"id\":\s*(\d+).*?\"userType\":\s*\"CUSTOMER\"", all_scripts, re.DOTALL)
+        endpoint_match = re.search(r'"endpoints":\s*\[\{\s*"id":\s*(\d+)', all_scripts, re.DOTALL)
+        
+        if not user_match or not endpoint_match:
+            user_match = re.search(r'"id":\s*(\d+).*?"userType":\s*"CUSTOMER"', all_scripts, re.DOTALL)
+            endpoint_match = re.search(r'"endpoints":\s*\[\{\s*"id":\s*(\d+)', all_scripts, re.DOTALL)
+            
+            if not user_match or not endpoint_match:
+                raise ValueError("Could not extract userId or endpointId from scripts")
+        
+        return int(user_match.group(1)), int(endpoint_match.group(1))
\ No newline at end of file
diff --git a/LidlConnect/helpers.py b/LidlConnect/helpers.py
new file mode 100644
index 0000000..e0aa745
--- /dev/null
+++ b/LidlConnect/helpers.py
@@ -0,0 +1,34 @@
+"""Helper functions for Lidl Connect library."""
+
+from functools import wraps
+import time
+
+def ttl_cache(ttl_seconds=30):
+    """
+    Time-based cache decorator.
+    
+    Args:
+        ttl_seconds: Number of seconds to cache the result
+        
+    Returns:
+        Decorated function with caching
+    """
+    def decorator(func):
+        cache = {}
+        
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            now = time.time()
+            key = str(args) + str(kwargs)
+            
+            if key in cache:
+                result, timestamp = cache[key]
+                if now - timestamp < ttl_seconds:
+                    return result
+            
+            result = func(*args, **kwargs)
+            cache[key] = (result, now)
+            return result
+        
+        return wrapper
+    return decorator
\ No newline at end of file
diff --git a/LidlConnect/requirements.txt b/LidlConnect/requirements.txt
new file mode 100644
index 0000000..1f311f5
--- /dev/null
+++ b/LidlConnect/requirements.txt
@@ -0,0 +1,2 @@
+requests
+bs4
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..54d6f32
--- /dev/null
+++ b/README.md
@@ -0,0 +1,84 @@
+# LidlConnect.py
+
+[![PyPI version](https://badge.fury.io/py/LidlConnect.py.svg)](https://badge.fury.io/py/LidlConnect.py)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+A Python library for accessing your Lidl Connect account through the Self-Care API.
+
+## Features
+
+- 📱 View your current data, minutes, and SMS usage
+- 💰 Check your account balance and payment history
+- 📅 View tariff details and package validity dates
+- 🧾 Access invoice and voucher history
+- 🔄 Automatic session management with proper login/logout
+
+## Installation
+
+Install directly from PyPI:
+
+```bash
+pip install LidlConnect.py
+```
+
+## Quick Start
+
+```python
+from LidlConnect import LidlConnect
+
+# Initialize with PUK (preferred method)
+client = LidlConnect(identifier="069012345678", puk="12345678")
+
+# Or initialize with password
+# client = LidlConnect(identifier="069012345678", password="yourPassword")
+
+# Login and initialize connection
+if not client.initialize():
+    print("Failed to initialize client")
+    exit(1)
+
+# Get remaining data
+data_info = client.get_remaining_data()
+print(f"Data: {data_info['remaining']}/{data_info['total']} GiB")
+
+# Check minutes
+minutes_info = client.get_remaining_minutes()
+print(f"Minutes: {minutes_info['remaining']}/{minutes_info['total']} minutes")
+
+# Get EU roaming data
+eu_data_info = client.get_remaining_eu_data()
+print(f"EU Data: {eu_data_info['remaining']}/{eu_data_info['total']} GiB")
+
+# Access account information
+print(f"User: {client.user_name}")
+print(f"Balance: €{client.balance if client.balance is not None else 'N/A'}")
+print(f"Package valid until: {client.tariff_package_valid_to}")
+
+# View payment history
+client.print_invoices()
+
+# Logout when done (automatic on program exit, but explicit is better)
+client.logout()
+```
+
+## Documentation
+
+For complete documentation of all features and methods, please refer to the [API documentation](apiDoc.md).
+
+## Requirements
+
+- Python 3.6+
+- `requests` library
+- `beautifulsoup4` library
+
+## Supported Services
+
+This library currently supports the Austrian Lidl Connect service (https://selfcare.lidl-connect.at). It's designed to work with accounts that have at least one active tariff package.
+
+## License
+
+MIT License
+
+## Disclaimer
+
+This is an unofficial library and is not affiliated with, maintained, authorized, endorsed, or sponsored by Lidl or any of its affiliates (like Drei).
diff --git a/apiDoc.md b/apiDoc.md
new file mode 100644
index 0000000..385df86
--- /dev/null
+++ b/apiDoc.md
@@ -0,0 +1,535 @@
+# LidlConnect API Documentation
+
+A Python client library for interacting with the Lidl Connect Self-Care portal API.
+
+## Table of Contents
+
+- [Installation](#installation)
+- [Quick Start](#quick-start)
+- [Authentication](#authentication)
+- [Core Client](#core-client)
+- [Usage Data](#usage-data)
+- [User Information](#user-information)
+- [Tariffs](#tariffs)
+- [Invoices and Payments](#invoices-and-payments)
+- [Utility Methods](#utility-methods)
+- [Caching](#caching)
+- [Error Handling](#error-handling)
+
+## Installation
+
+```python
+# Clone the repository
+git clone https://github.com/MarcUs7i/LidlConnect.git
+
+# Install dependencies
+pip install -r requirements.txt
+```
+
+Required dependencies:
+- `requests`
+- `beautifulsoup4`
+
+## Quick Start
+
+```python
+from LidlConnect import LidlConnect
+
+# Initialize with PUK
+client = LidlConnect(identifier="069012345678", puk="12345678")
+
+# Or initialize with password
+# client = LidlConnect(identifier="069012345678", password="yourPassword")
+
+# Login and initialize connection
+if not client.initialize():
+    print("Failed to initialize client")
+    exit(1)
+
+# Get usage information
+data_info = client.get_remaining_data()
+print(f"Data: {data_info['remaining']}/{data_info['total']} GiB")
+
+# Logout when done
+client.logout()
+```
+
+## Authentication
+
+### LidlConnect(identifier, puk=None, password=None)
+
+Initialize the Lidl Connect client.
+
+**Parameters:**
+- `identifier` (str): Your phone number or customer ID
+- `puk` (str, optional): Your PUK code (required if password not provided)
+- `password` (str, optional): Your password (required if PUK not provided)
+
+**Example:**
+```python
+# Using PUK
+client = LidlConnect(identifier="069012345678", puk="12345678")
+
+# Using password
+client = LidlConnect(identifier="069012345678", password="yourPassword")
+```
+
+### initialize() → bool
+
+Initialize the client by logging in, fetching the dashboard, and extracting necessary tokens and IDs.
+
+**Returns:**
+- `bool`: True if initialization successful, False otherwise
+
+**Example:**
+```python
+if not client.initialize():
+    print("Failed to initialize client")
+    exit(1)
+```
+
+### login() → bool
+
+Log in to Lidl Connect using the provided credentials.
+
+**Returns:**
+- `bool`: True if login successful, False otherwise
+
+**Example:**
+```python
+success = client.login()
+```
+
+### logout() → bool
+
+Log out from Lidl Connect, clearing the session.
+
+**Returns:**
+- `bool`: True if logout successful, False otherwise
+
+**Example:**
+```python
+client.logout()
+```
+
+## Core Client
+
+The client automatically handles session management and token extraction, it tries to log out when the program is about to exit or to get killed.
+
+**Properties:**
+- `identifier` (str): The phone number or customer ID
+- `user_id` (int): The user ID extracted from the dashboard
+- `endpoint_id` (int): The endpoint ID extracted from the dashboard
+- `logged_in` (bool): Whether the client is currently logged in
+- `csrf_token` (str): The CSRF token for API requests
+
+## Usage Data
+
+Methods for getting and displaying usage data.
+
+### get_usage_data() → Dict[str, Any]
+
+Get raw usage data for the current account.
+
+**Returns:**
+- `Dict[str, Any]`: Usage data including instanceGroups with counters
+
+**Cache TTL:** 5 seconds
+
+**Example:**
+```python
+usage_data = client.get_usage_data()
+```
+
+### print_usage_summary(data=None) → None
+
+Pretty-print usage summary data.
+
+**Parameters:**
+- `data` (Dict[str, Any], optional): Optional usage data. If None, will fetch new data
+
+**Example:**
+```python
+client.print_usage_summary()
+```
+
+### get_remaining_data() → Dict[str, float]
+
+Get remaining data balance (in GiB).
+
+**Returns:**
+- `Dict[str, float]`: Dictionary with keys "remaining", "total", and "used" in GiB
+
+**Example:**
+```python
+data_info = client.get_remaining_data()
+print(f"Data: {data_info['remaining']}/{data_info['total']} GiB")
+```
+
+### get_remaining_eu_data() → Dict[str, float]
+
+Get remaining EU data balance (in GiB).
+
+**Returns:**
+- `Dict[str, float]`: Dictionary with keys "remaining", "total", and "used" in GiB
+
+**Example:**
+```python
+eu_data_info = client.get_remaining_eu_data()
+print(f"EU Data: {eu_data_info['remaining']}/{eu_data_info['total']} GiB")
+```
+
+### get_remaining_minutes() → Dict[str, float]
+
+Get remaining voice minutes.
+
+**Returns:**
+- `Dict[str, float]`: Dictionary with keys "remaining", "total", and "used" in minutes
+
+**Example:**
+```python
+minutes_info = client.get_remaining_minutes()
+print(f"Minutes: {minutes_info['remaining']}/{minutes_info['total']} minutes")
+```
+
+### tariff_package_valid_from → Optional[str]
+
+Get the start date of the current tariff package.
+
+**Returns:**
+- `str`: ISO formatted date string or None if not available
+
+**Example:**
+```python
+print(f"Package valid from: {client.tariff_package_valid_from}")
+```
+
+### tariff_package_valid_to → Optional[str]
+
+Get the end date of the current tariff package.
+
+**Returns:**
+- `str`: ISO formatted date string or None if not available
+
+**Example:**
+```python
+print(f"Package valid to: {client.tariff_package_valid_to}")
+```
+
+### tariff_package_details → Optional[Dict[str, Any]]
+
+Get detailed information about the current tariff package.
+
+**Returns:**
+- `Dict[str, Any]`: Dictionary containing name, category, validFrom, validTo and counter details or None if not available
+
+**Example:**
+```python
+details = client.tariff_package_details
+if details:
+    print(f"Package name: {details['name']}")
+    print(f"Valid from: {details['validFrom']} to {details['validTo']}")
+```
+
+## User Information
+
+Methods for retrieving user account information.
+
+### _get_user_data() → Dict[str, Any]
+
+Get user data from the server. This is an internal method used by the properties below.
+
+**Returns:**
+- `Dict[str, Any]`: User data including name, type, accounts, etc.
+
+**Cache TTL:** 30 seconds
+
+### user_name → Optional[str]
+
+Get user's name.
+
+**Returns:**
+- `str`: User's name or None if not available
+
+**Example:**
+```python
+print(f"User name: {client.user_name}")
+```
+
+### user_type → Optional[str]
+
+Get user's type (e.g., 'CUSTOMER').
+
+**Returns:**
+- `str`: User type or None if not available
+
+**Example:**
+```python
+print(f"User type: {client.user_type}")
+```
+
+### has_password → bool
+
+Check if user has set a password.
+
+**Returns:**
+- `bool`: True if the user has a password, False otherwise
+
+**Example:**
+```python
+if client.has_password:
+    print("User has a password set")
+```
+
+### birth_date → Optional[str]
+
+Get user's birth date.
+
+**Returns:**
+- `str`: Birth date or None if not available
+
+**Example:**
+```python
+print(f"Birth date: {client.birth_date}")
+```
+
+### status → Optional[str]
+
+Get endpoint status (e.g., 'ACTIVE').
+
+**Returns:**
+- `str`: Endpoint status or None if not available
+
+**Example:**
+```python
+print(f"Status: {client.status}")
+```
+
+### customer_type → Optional[str]
+
+Get customer type (e.g., 'ANONYM').
+
+**Returns:**
+- `str`: Customer type or None if not available
+
+**Example:**
+```python
+print(f"Customer type: {client.customer_type}")
+```
+
+### customer_language → Optional[str]
+
+Get customer language preference.
+
+**Returns:**
+- `str`: Customer language or None if not available
+
+**Example:**
+```python
+print(f"Language: {client.customer_language}")
+```
+
+### balance → Optional[float]
+
+Get account balance.
+
+**Returns:**
+- `float`: Account balance or None if not available
+
+**Example:**
+```python
+print(f"Balance: €{client.balance if client.balance is not None else 'N/A'}")
+```
+
+### activation_date → Optional[str]
+
+Get activation date.
+
+**Returns:**
+- `str`: ISO formatted activation date or None if not available
+
+**Example:**
+```python
+print(f"Activation date: {client.activation_date}")
+```
+
+### deactivation_date → Optional[str]
+
+Get deactivation date.
+
+**Returns:**
+- `str`: ISO formatted deactivation date or None if not available
+
+**Example:**
+```python
+print(f"Deactivation date: {client.deactivation_date}")
+```
+
+## Tariffs
+
+Methods for retrieving and displaying available tariffs.
+
+### get_tariffs() → List[Dict[str, Any]]
+
+Get all available tariffs for the current account.
+
+**Returns:**
+- `List[Dict[str, Any]]`: List of tariff objects with relevant information
+
+**Cache TTL:** 60 seconds
+
+**Example:**
+```python
+tariffs = client.get_tariffs()
+```
+
+### print_tariffs() → None
+
+Pretty-print available tariffs.
+
+**Example:**
+```python
+client.print_tariffs()
+```
+
+The output includes:
+- Tariff name (German name if available)
+- Tariff ID
+- Details (cleaned from HTML, can look terrible)
+- Featured status
+- Visibility status
+
+## Invoices and Payments
+
+Methods for getting and displaying invoice and voucher history.
+
+### get_invoices() → List[Dict[str, Any]]
+
+Get list of invoices for the current account.
+
+**Returns:**
+- `List[Dict[str, Any]]`: List of invoice objects with transaction details
+
+**Cache TTL:** 30 seconds
+
+**Example:**
+```python
+invoices = client.get_invoices()
+```
+
+### get_vouchers() → List[Dict[str, Any]]
+
+Get list of consumed vouchers for the current account.
+
+**Returns:**
+- `List[Dict[str, Any]]`: List of voucher objects with transaction details
+
+**Cache TTL:** 30 seconds
+
+**Example:**
+```python
+vouchers = client.get_vouchers()
+```
+
+### print_invoices() → None
+
+Pretty-print invoice and voucher history.
+
+**Example:**
+```python
+client.print_invoices()
+```
+
+The output includes:
+- Transaction details for invoices (ID, date, amount, payment method)
+- Voucher details (ID, serial, value, consumption date)
+
+### get_total_spent() → float
+
+Calculate the total amount spent across all invoices and vouchers.
+
+**Returns:**
+- `float`: Total amount in euros
+
+**Example:**
+```python
+total = client.get_total_spent()
+print(f"Total spent: €{total:.2f}")
+```
+
+### last_payment_date → Optional[str]
+
+Get the date of the most recent payment from either invoices or vouchers.
+
+**Returns:**
+- `str`: ISO formatted date string or None if no payments
+
+**Example:**
+```python
+print(f"Last payment date: {client.last_payment_date}")
+```
+
+## Utility Methods
+
+General API utilities for Lidl Connect.
+
+### make_api_request(url, data=None, method="POST") → Union[Dict[str, Any], str]
+
+Make a generic API request to Lidl Connect.
+
+**Parameters:**
+- `url` (str): API endpoint to call
+- `data` (Dict, optional): Payload to send
+- `method` (str, optional): HTTP method (default: "POST")
+
+**Returns:**
+- `Dict[str, Any]` or `str`: API response (JSON parsed if Content-Type is application/json)
+
+**Example:**
+```python
+response = client.make_api_request(
+    "https://selfcare.lidl-connect.at/customer/some-endpoint", 
+    data={"key": "value"}
+)
+```
+
+## Caching
+
+The library has a time-based cache for API requests to reduce load and improve performance.
+
+Key caching parameters:
+- Usage data: 5 seconds TTL
+- User data: 30 seconds TTL
+- Invoices and vouchers: 30 seconds TTL
+- Tariffs: 60 seconds TTL
+
+The cache is implemented using the `ttl_cache` decorator in helpers.py.
+
+## Error Handling
+
+Most methods raise `ValueError` exceptions when:
+- Not logged in or missing CSRF token
+- API requests fail
+- Required data is missing
+
+All public properties safely handle exceptions internally and return None when errors occur, ensuring your application doesn't crash.
+
+Example of error handling:
+
+```python
+try:
+    client = LidlConnect(identifier="069012345678", puk="12345678")
+    if not client.initialize():
+        print("Failed to initialize client")
+        exit(1)
+        
+    # Your code here
+    
+except ValueError as e:
+    print(f"API error: {e}")
+except Exception as e:
+    print(f"Unexpected error: {e}")
+finally:
+    if hasattr(client, 'logout') and client.logged_in:
+        client.logout()
+```
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