Fix class name and imports

solidgate/__init__.py

@@ -1,2 +1,2 @@
 from .api_client import ApiClient
-from .api_client import MerchantData
+from .api_client import FormUpdateDTO, FormInitDTO

solidgate/api_client.py

@@ -8,7 +8,7 @@
 import requests
 
 from solidgate.encryption import AESCipher
-from solidgate.model import MerchantData
+from solidgate.model import FormInitDTO, FormUpdateDTO
 
 
 class ApiClient:

solidgate/model.py

@@ -4,7 +4,7 @@ def __init__(self, payment_intent: str, publicKey: str, signature: str):
         self.merchant = publicKey
         self.signature = signature
 
-class FormInitDTO:
+class FormUpdateDTO:
     def __init__(self, partial_intent: str, signature: str):
         self.partial_intent = partial_intent
-        self.signature = signature
+        self.signature = signature