feat: purchases added

src/domain/__init__.py

@@ -4,8 +4,11 @@ __all__ = (
     'TargetChannel',
     'ExternalChannel',
     'Creative',
+    'Purchase',
     'TargetChannelStatus',
     'CreativeStatus',
+    'PurchaseStatus',
+    'InviteLinkType',
     'LoginToken',
     'UserNotFound',
     'LoginTokenNotFound',
@@ -18,6 +21,7 @@ __all__ = (
     'ExternalChannelAlreadyExists',
     'CreativeNotFound',
     'CreativeInUse',
+    'PurchaseNotFound',
 )
 
 from .base import Base
@@ -32,10 +36,12 @@ from .error import (
     LoginTokenAlreadyUsed,
     LoginTokenExpired,
     LoginTokenNotFound,
+    PurchaseNotFound,
     TargetChannelNotFound,
     UserNotFound,
 )
 from .external_channel import ExternalChannel
 from .login_token import LoginToken
+from .purchase import InviteLinkType, Purchase, PurchaseStatus
 from .target_channel import TargetChannel, TargetChannelStatus
 from .user import User