AC-16602: Customer Balance API Documentation

[shashi011]

Purpose of this pull request

Added API documentation for the new REST endpoint introduced to support Customer Balance Admin functionality.
JIRA Ticket : https://jira.corp.adobe.com/browse/AC-16410

Affected pages

• ...

Links to Magento Open Source code

• ...

[shashi011]

@keharper
Please review the following new REST API endpoints added to the Admin API schema (Commerce 2.4.8):
Endpoints:
POST /V1/carts/{cartId}/balance/apply - Apply store credit balance to a cart
DELETE /V1/carts/{cartId}/balance/unapply - Unapply store credit balance from a cart
GET /V1/customers/{customerId}/balance/{websiteId} - Get store credit balance for a customer and website
Changes:
Added endpoint definitions, tags, and tag groups
Created schema definition: customer-balance-data-balance-interface
File: src/openapi/admin-schema-2.4.8.yaml
Please review for correctness and consistency with existing API patterns. Also, please confirm if we need to update any other files or documentation for these REST changes. Thanks!

[shashi011]

hi @keharper
Just wanted to gently follow up on my previous PR for the new Admin API REST endpoints for Customer Balance (Commerce 2.4.8). Whenever you have some time, I’d really appreciate it if you could review it and share your feedback on correctness and alignment with existing API patterns. Also, please let me know if any additional updates (docs or other files) are needed.