<!-- Describe your changes in detail -->
1)Added Refunds Flow for the Fpx payment Method
To implement this **search_filter** feature, you'll need to modify these architectural layers:


**1. Domain Models (Business Logic Types)**
   - `crates/hyperswitch_domain_models/src/router_request_types.rs`

**2. Core Business Logic**
   - `crates/router/src/core/payments/helpers.rs`
   - `crates/router/src/core/relay/utils.rs`
   - `crates/router/src/core/utils.rs`

**3. External Connector Integration**
   - `crates/hyperswitch_connectors/src/connectors/fiuu/transformers.rs`
   - `crates/router/tests/connectors/utils.rs`

**Code Patterns Applied:**
- Implement new functions (1 changes)
- Extend existing types with new fields (11 changes)
- Add conditional logic for feature flags or filtering (1 changes)

**Detailed Identifier Changes:**


Commit f71bbb50:
Files to modify:


**crates/hyperswitch_connectors/src/connectors/fiuu/transformers.rs**
  Modify existing code

**crates/hyperswitch_domain_models/src/router_request_types.rs**
  Modify existing code

**crates/router/src/core/payments/helpers.rs**
  Modify existing code

**crates/router/src/core/relay/utils.rs**
  Modify existing code

**crates/router/src/core/utils.rs**
  Modify existing code

**crates/router/tests/connectors/utils.rs**
  Modify existing code
{"pr_number": 7890, "pr_title": "feat(connector): Fix FPX refunds for Fiuu", "merged_at": "2025-04-25T12:58:29Z", "intent": {"feature_type": "search_filter", "action": "add_feature", "entities": ["customer", "payment", "merchant"]}, "hierarchy": {"domain": ["crates/hyperswitch_domain_models/src/router_request_types.rs"], "core_business": ["crates/router/src/core/payments/helpers.rs", "crates/router/src/core/relay/utils.rs", "crates/router/src/core/utils.rs"], "connectors": ["crates/hyperswitch_connectors/src/connectors/fiuu/transformers.rs", "crates/router/tests/connectors/utils.rs"]}, "change_types": {"functions_added": 1, "enums_added": 1, "fields_added": 11, "imports_added": 1, "conditionals_added": 1}, "has_identifier_data": true, "commits_matched": 1, "match_method": "pr_number"}