✨(marketing) create marketing backend abstraction

Marteking backends will have to implement an abstract base backend in
order to be able to not be dependant from only one implementation

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added
+
+- ✨(marketing) create marketing module
+
 ## [0.0.21] - 2025-12-04
 
 ### Added

src/lasuite/marketing/__init__.py

@@ -0,0 +1 @@
+"""Marketing module."""

src/lasuite/marketing/backends/__init__.py

@@ -0,0 +1,13 @@
+"""Marketing backends module."""
+
+from dataclasses import dataclass
+
+
+@dataclass
+class ContactData:
+    """Contact data for marketing service integration."""
+
+    email: str
+    attributes: dict[str, str] | None = None
+    list_ids: list[int] | None = None
+    update_enabled: bool = True

src/lasuite/marketing/backends/base.py

@@ -0,0 +1,26 @@
+"""Marketing backend base module."""
+
+from abc import ABC, abstractmethod
+
+from lasuite.marketing.backends import ContactData
+
+
+class BaseBackend(ABC):
+    """Base class for all marketing backends."""
+
+    @abstractmethod
+    def create_or_update_contact(self, contact_data: ContactData, timeout: int = None) -> dict:
+        """
+        Create or update a contact.
+
+        Args:
+            contact_data: Contact information and attributes
+            timeout: API request timeout in seconds
+
+        Returns:
+            dict: Service response
+
+        Raises:
+            ContactCreationError: If contact creation fails
+
+        """