feat(connector): [PLAID] add bank_name field to BankAccount

[Aishwariyaa-Anand]

Description

Adds optional bank_name to BankAccount in proto message and domain struct. Maps Plaid auth/get response item.institution_name to bank_name for all account types.

Motivation and Context

Additional Changes

• This PR modifies the API contract
• This PR modifies application configuration/environment variables

How did you test it?

Request

curl --location 'http://localhost:8011/composite/payment_methods/get' \
--header 'Content-Type: application/json' \
--header 'x-connector-config: {"config":{"Plaid":{"client_id":"-","secret":"-"}}}' \
--header 'x-merchant-id: test_merchant' \
--header 'x-tenant-id: public' \
--header 'x-request-id: req-plaid-flow3-001' \
--header 'x-auth-connector: plaid' \
--data '{
  "payment_method_token": "-",
  "payment_method_type": "ACH"
}'

Response

{
    "get_response": {
        "connector_payment_method_id": "-",
        "payment_method_details": {
            "details": {
                "BankAccount": {
                    "accounts": [
                        {
                            "account_name": "Plaid Checking",
                            "account_id": "-",
                            "bank_type": "BANK_TYPE_CHECKING",
                            "bank_holder_type": "BANK_HOLDER_TYPE_PERSONAL",
                            "balance": {
                                "minor_amount": 11000,
                                "currency": "USD"
                            },
                            "available_balance": {
                                "minor_amount": 10000,
                                "currency": "USD"
                            },
                            "bank_name": "First Platypus Bank",
                            "account_details": {
                                "Ach": {
                                    "account_number": "-",
                                    "routing_number": "-"
                                }
                            }
                        },
                        {
                            "account_name": "Plaid Saving",
                            "account_id": "-",
                            "bank_type": "BANK_TYPE_SAVINGS",
                            "bank_holder_type": "BANK_HOLDER_TYPE_PERSONAL",
                            "balance": {
                                "minor_amount": 21000,
                                "currency": "USD"
                            },
                            "available_balance": {
                                "minor_amount": 20000,
                                "currency": "USD"
                            },
                            "bank_name": "First Platypus Bank",
                            "account_details": {
                                "Ach": {
                                    "account_number": "-",
                                    "routing_number": "-"
                                }
                            }
                        },
                        {
                            "account_name": "Plaid Cash Management",
                            "account_id": "-",
                            "balance": {
                                "minor_amount": 1206000,
                                "currency": "USD"
                            },
                            "available_balance": {
                                "minor_amount": 1206000,
                                "currency": "USD"
                            },
                            "bank_name": "First Platypus Bank",
                            "account_details": {
                                "Ach": {
                                    "account_number": "-",
                                    "routing_number": "-"
                                }
                            }
                        }
                    ]
                }
            }
        },
        "status_code": 200,
        "response_headers": {
            "x-envoy-upstream-service-time": "255",
            "x-content-type-options": "nosniff",
            "strict-transport-security": "max-age=31536000; includeSubDomains; preload",
            "x-envoy-decorator-operation": "lazyxds.svc-apiv2:8080/*",
            "date": "Tue, 04 Aug 2026 07:34:28 GMT",
            "connection": "keep-alive",
            "server": "nginx",
            "content-type": "application/json; charset=utf-8",
            "x-xss-protection": "1; mode=block",
            "vary": "Accept-Encoding",
            "x-frame-options": "DENY",
            "plaid-version": "2020-09-14"
        },
        "raw_connector_response": "-",
        "raw_connector_request": "-"
    }
}