Add subscriotn

app/models/members_products.py

@@ -47,6 +47,22 @@ class MembersProducts(db.Model):
             return None
         return member_product
 
+    @classmethod
+    def create_subscription(cls, member_id ,product_id,status,internal_url):
+        # Create the subscription
+        subscription = cls(
+            member_id=member_id,
+            product_id=product_id,
+            status=status,
+            internal_url=internal_url
+        )
+
+        try:
+            db.session.add(subscription)
+        except IntegrityError as err:
+            raise ValueError(f"Database integrity error: {err}")
+        return subscription
+
 
     def to_dict(self):
         """