post https://api.trifft.io/v1/card//coupon/redeem
This endpoint allows a user to redeem a coupon associated with their loyalty card.
The client must provide at least one identifier to specify the coupon to be redeemed:
- a user-specific coupon ID (user_coupon_id)
- a general coupon ID (coupon_id)
- or a coupon code (coupon_code, such as a barcode or QR code)
The server will attempt to locate and redeem the correct coupon based on the provided input.
If multiple identifiers are provided, the user_coupon_id takes precedence, followed by the coupon_code, and finally the coupon_id.