(merchant)- cahnged merchant_id,store_type,can_transact_with fields as optional

app/merchants/schemas/schema.py

@@ -160,8 +160,8 @@ class KYCModel(BaseModel):
 class MerchantCreate(BaseModel):
     """Schema for creating a new merchant"""
 
-    merchant_id: constr(pattern=MERCHANT_ID_REGEX.pattern) = Field(
-        ...,
+    merchant_id: Optional[constr(pattern=MERCHANT_ID_REGEX.pattern)] = Field(
+        None,
         description="Unique merchant ID (UUID format)."
     )
 
@@ -170,8 +170,8 @@ class MerchantCreate(BaseModel):
         description="Type of merchant organization"
     )
 
-    can_transact_with: List[str] = Field(
-        ...,
+    can_transact_with: Optional[List[str]]= Field(
+        None,
         description="List of merchant IDs this merchant can transact with"
     )
 
@@ -190,8 +190,8 @@ class MerchantCreate(BaseModel):
         description="Merchant business name"
     )
 
-    store_type: str = Field(
-        ...,
+    store_type: Optional[str] = Field(
+        None,
         description="Type of store (e.g., Retail, Wholesale, Online, Hybrid)"
     )