Add discount to cart

Principles

• Use a discount code for a cart, if applied the response will contain the code.
• Only one code per cart is allowed. Sending a new valid code will overwrite any existing code.

To remove any discount code that has been applied to the cart use:

curl --request PUT \
  --url https://api.${env}.brinkcommerce.com/orderv1/carts \
  --header 'authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZXNzaW9uSWQiOiI3M2U3NTY3MS00NTUzLTRlODctYTkyYS01NGUwMDk0N2E2ZWIiLCJpYXQiOjE2MDA5NzIwMzEsImV4cCI6MTYwMTIzMTIzMX0.KZwLePY_3qC5RtsUzSAbCv30raHM0lUtm0QnGKS_UA4' \
  --header 'content-type: application/json' \
  --data '{
    "deleteDiscount": true
  }'