Returns if found a coupon based on the given coupon code.

Error message returned when the request fails validation or processing. For warnings and successful responses, consumers should usually inspect Result, Code and Severity first.

Legacy numeric error code derived from internal API errors when available. This field is relevant only for error flows that use ApiResponseErrorDescription.

Endpoint-specific business code formatted as a two-digit string, such as 03 or 07. This field is available for success, warning and error outcomes.

Symbolic enum name associated with Code, such as CheckoutNotFound.

0 = Success 1 = Warning 2 = Error

Convenience flag that is true when Severity is Warning. Warnings are valid 200 OK business outcomes and should not be handled as transport or validation errors.

Indicates whether the request failed and should be handled as an error response. This flag is reserved for real API errors; warnings must keep this property as false.