feat(connector): [PAYPAL] Add Integrity Check for Authorize, Capture,…

[TharunChinnannagari]

feat(connector): [PAYPAL] Add Integrity Check for Authorize, PSync, Refund & RSync

Type of Change

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

Description

In this PR, we have added integrity checks for Authorize, PSync, Refund and RSync flows for PayPal Connector.

What is an integrity check?
A scenario where there is a discrepancy between the amount sent in the request and the amount received from the connector, which is checked during response handling.

Implementation details:

• Added integrity check calls in handle_response functions for each flow in crates/hyperswitch_connectors/src/connectors/paypal.rs
• Utilized existing utility functions from crates/hyperswitch_connectors/src/utils.rs:
  • get_authorise_integrity_object for Authorize flow
  • get_sync_integrity_object for PSync flow
  • get_refund_integrity_object for Refund and RSync flows
• Made necessary fields public in crates/hyperswitch_connectors/src/connectors/paypal/transformers.rs to access amount and currency data from PayPal responses
• Added amount field to RefundSyncResponse struct for proper refund sync validation
• Implemented fallback logic for cases where amount/currency may not be directly available in connector response (e.g., redirect flows, 3DS flows)

Additional Changes

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

Motivation and Context

Motivation and Context

How did you test it?

Checklist

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

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Changed Files

File	Status
crates/hyperswitch_connectors/src/connectors/paypal/transformers.rs	6% smaller
crates/hyperswitch_connectors/src/connectors/paypal.rs	4% smaller
crates/router/tests/connectors/paypal.rs	0% smaller
cypress-tests/cypress/e2e/spec/Payment/00033-PaypalIntegrityCheck.cy.js	0% smaller