feat(router): Add is_split_payment field to payments response (v2)

[AnuthaDev]

Type of Change

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

Description

• Added a field is_split_payment to Payments - List Response. Used by dashboard to show whether a payment is a split payment in the Payment Operations Screen.

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 #10139

How did you test it?

Request:

curl --location 'http://localhost:8080/v2/payments/list' \
--header 'Content-Type: application/json' \
--header 'x-profile-id: pro_HzkiTClLRhwyS1wsZVh8' \
--header 'Authorization: api-key=dev_f0AKEGnVxI8krvop8qE1DpicS4ip8NHm0MEQJJ4aQUiuGuBg4ua5OK8OvEOluOJp' \
--header 'api-key: dev_f0AKEGnVxI8krvop8qE1DpicS4ip8NHm0MEQJJ4aQUiuGuBg4ua5OK8OvEOluOJp'

Response:

{
    "count": 1,
    "total_count": 1,
    "data": [
        {
            "id": "12345_pay_019a57fd21f670a39cca26adff34121d",
            "merchant_id": "cloth_seller_v2_yDO5Rd1r7V2S8L0eFYg1",
            "profile_id": "pro_HzkiTClLRhwyS1wsZVh8",
            "customer_id": "12345_cus_019a57fd056a7ac189e218d16a4b37b5",
            "payment_method_id": null,
            "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
            },
            "created": "2025-11-06T07:06:38.466Z",
            "payment_method_type": "card",
            "payment_method_subtype": "card",
            "connector": "adyen",
            "merchant_connector_id": "mca_9z2OVPuwa2ohCwwElOfN",
            "customer": null,
            "merchant_reference_id": null,
            "connector_payment_id": "B9G4KNPFWGF5K5V5",
            "connector_response_reference_id": "12345_att_019a57fd2e8679a28ef3ba504d91b5fe",
            "metadata": null,
            "description": null,
            "authentication_type": "no_three_ds",
            "capture_method": "manual",
            "setup_future_usage": "on_session",
            "attempt_count": 0,
            "error": null,
            "cancellation_reason": null,
            "order_details": null,
            "return_url": null,
            "statement_descriptor": null,
            "allowed_payment_method_types": null,
            "authorization_count": 0,
            "modified_at": "2025-11-06T07:06:44.978Z",
            "is_split_payment": false
        }
    ]
}

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
api-reference/v2/openapi_spec_v2.json	29% smaller
crates/api_models/src/payments.rs	0% smaller
crates/hyperswitch_domain_models/src/payments.rs	0% smaller
crates/router/src/core/payments/transformers.rs	0% smaller

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@0b08059). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
crates/hyperswitch_domain_models/src/payments.rs	0.00%	4 Missing ⚠️
crates/router/src/core/payments/transformers.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10140   +/-   ##
=======================================
  Coverage        ?    4.05%           
=======================================
  Files           ?     1227           
  Lines           ?   304998           
  Branches        ?        0           
=======================================
  Hits            ?    12369           
  Misses          ?   292629           
  Partials        ?        0           

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