Applies a new incentive to a cart.

Mandatory Fields:

• incentive.Codes - must not be null or empty; all entries must be non-blank strings

Required Fields:

• cartId (route) - required
• incentive (body) - required

Responses

• 200 OK: the incentive was applied to the cart.
• 400 Bad Request: the request payload is invalid.
• 500 Internal Server Error: an unexpected error occurred.