Add Authorize.net Saved Card
Adds a card to the customer's Authorize.net profile. Requires customer billing address.
Required body fields: `cardNumber`, `cardExpiry`, `cardCvv`.
Response fields: saved card profile fields including `customerProfileId`, `customerPaymentProfileId`, and masked `cardDetails`.
Possible errors:
- 400: Missing card profile - delete route did not include `customerPaymentProfileId`.
- 400: Please set your billing address to continue - billing address is required to add a card.
- 404: Billing address not found - saved billing address reference is invalid.
- 404: Saved card not found - card profile does not exist or is inactive.
- 400: Authorize.net card profile was not created - gateway did not return profile ids.
- 400: Missing One or More Required Parameters - required body/query fields were not supplied.
- 401: Unauthorized - token is missing, expired, invalid, or the account/token pair was not found.
- 403: Access denied - gateway traffic guard/rate policy blocked the request.
- 429: Too many requests - gateway rate limit exceeded.
- 500: Unexpected Error - unhandled gateway or downstream service failure.