Checkouts

Adds a discount to an existing checkout.

Use this endpoint to apply the following discounts:

• Apply a manual discount to a cart. In this case, you can distribute the discount between each line item in the cart based on the item value.
• Apply a manual discount against a specific line item.
• Apply a manual discount at the item-level with a cart-level discount.

Notes:

• When you call this API, you clear out all existing discounts applied to line items, including product and order-based discounts.
• You cannot apply a manual discount to a specific line item if you have already applied a coupon or automatic promotion to it.

Required Fields:

• discounted_amount at the cart-level or at the item-level