first commit

app/api/services/base_service.py

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+from app.models import Customer, Account, Transaction
+from app.api.enums import TransactionType
+from flask import jsonify
+from marshmallow import ValidationError
+import logging
+from app.api.integrations import KafkaIntegration
+
+logger = logging.getLogger(__name__)
+
+class BaseService:
+    TRANSACTION_TYPE = None
+
+    @classmethod
+    def validate_data(cls, data, schema):
+        """
+        Validate input data based on the provided schema.
+        """
+        logger.info(f"Processing {cls.TRANSACTION_TYPE} request")
+        return schema.load(data)
+
+    @classmethod
+    def get_or_create_customer(cls, validated_data):
+        
+        """
+        Check if a customer exists; if not, create one.
+        """
+
+        customer = Customer.query.filter_by(id=validated_data.get("customerId")).first()
+        if not customer:
+            customer = Customer.create_customer(
+                id=validated_data.get("customerId"),
+                msisdn=validated_data.get("msisdn"),
+                country_code=validated_data.get("countryCode"),
+                account_id=validated_data.get("accountId"),
+            )
+        return customer
+
+    @classmethod
+    def validate_account_ownership(cls, account_id, customer_id):
+        """
+        Check if the provided account belongs to the customer.
+        """
+        is_valid = Account.is_valid_account(account_id, customer_id)
+        return is_valid
+
+    @classmethod
+    def log_transaction(cls, validated_data):
+        """
+        Create a new transaction.
+        """
+        return Transaction.create_transaction(
+            transaction_id =validated_data.get("transactionId"),
+            account_id=validated_data.get("accountId"),
+            type=cls.TRANSACTION_TYPE,
+            channel=validated_data.get("channel"),
+        )
+    
+    @classmethod
+    def async_send_to_kafka(cls, loan_data, request_id, topic):
+        KafkaIntegration.send_loan_request(loan_data = loan_data, request_id = request_id, topic = topic)
+        KafkaIntegration.flush()