feat(router): Make payment_method_subtype optional in payment_attempt [V2]

[AnuthaDev]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Added diesel migration to make payment_method_subtype Nullable in payment_attempt table
• Made payment_method_subtype an Option in request and response structs

Additional Changes

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

Motivation and Context

Closes #7567

How did you test it?

1. Payments - Confirm:

curl --location 'http://localhost:8080/v2/payments/12345_pay_0195adf1544079139067663acdbff178/confirm-intent' \
--header 'x-client-secret: 12345_pay_0195adf1544079139067663acdbff178_secret_0195adf154487933ae61c8ca769286b0' \
--header 'x-profile-id: pro_6XA4kopfg4VAYLy2jNzW' \
--header 'Content-Type: application/json' \
--header 'api-key: pk_dev_196e797040ba4ecbb064ee14e53c8817' \
--data '{
    "payment_method_data": {
        "card": {
            "card_number": "4242424242424242",
            "card_exp_month": "05",
            "card_exp_year": "25",
            "card_holder_name": "John Doe",
            "card_cvc": "100"
        }
    },
    "payment_method_type": "card"
    
}'

Response:

{
    "id": "12345_pay_0195adf1544079139067663acdbff178",
    "status": "requires_capture",
    "amount": {
        "order_amount": 100,
        "currency": "USD",
        "shipping_cost": null,
        "order_tax_amount": null,
        "external_tax_calculation": "skip",
        "surcharge_calculation": "skip",
        "surcharge_amount": null,
        "tax_on_surcharge": null,
        "net_amount": 100,
        "amount_to_capture": null,
        "amount_capturable": 100,
        "amount_captured": 0
    },
    "customer_id": null,
    "connector": "stripe",
    "client_secret": "12345_pay_0195adf1544079139067663acdbff178_secret_0195adf154487933ae61c8ca769286b0",
    "created": "2025-03-19T10:27:09.001Z",
    "payment_method_data": {
        "billing": null
    },
    "payment_method_type": "card",
    "payment_method_subtype": null,
    "connector_transaction_id": "pi_3R4Jq8D5R7gDAGff1B5K8RjQ",
    "connector_reference_id": null,
    "merchant_connector_id": "mca_vwmIHkB372B5SHcDO0wC",
    "browser_info": null,
    "error": null,
    "shipping": null,
    "billing": null,
    "attempts": null,
    "connector_token_details": {
        "token": "pm_1R4Jq8D5R7gDAGffQmkzcinv",
        "connector_token_request_reference_id": "q0miVgxYfHkoOfwax6"
    },
    "payment_method_id": null,
    "next_action": null,
    "return_url": "https://google.com/success",
    "authentication_type": "no_three_ds",
    "authentication_type_applied": "no_three_ds"
}

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
crates/hyperswitch_connectors/src/connectors/chargebee/transformers.rs	97% smaller
crates/hyperswitch_domain_models/src/payments/payment_attempt.rs	70% smaller
crates/router/src/types/api/payment_methods.rs	64% smaller
crates/diesel_models/src/schema_v2.rs	62% smaller
crates/api_models/src/payment_methods.rs	60% smaller
crates/api_models/src/payments.rs	59% smaller
api-reference-v2/openapi_spec.json	56% smaller
crates/diesel_models/src/types.rs	23% smaller
crates/diesel_models/src/payment_attempt.rs	0% smaller
crates/hyperswitch_domain_models/src/payments.rs	0% smaller
crates/hyperswitch_domain_models/src/revenue_recovery.rs	0% smaller
crates/router/src/core/payment_methods.rs	0% smaller
crates/router/src/core/payments/routing.rs	0% smaller
crates/router/src/core/payments/transformers.rs	0% smaller
v2_migrations/2025-03-19-080705_payment-method-subtype-optional/down.sql	Unsupported file format
v2_migrations/2025-03-19-080705_payment-method-subtype-optional/up.sql	Unsupported file format

[swangi-kumari]

Reviewed connector files.