Add ability to redeem coupon/reward codes through Orders API

Hi. I’d like the ability to redeem a coupon/reward code (I’ve seen these codes referred to with both names) at checkout. On my Square-generated e-commerce site, there is an option to “add coupon code” before clicking the checkout button. Doing this with a valid code updates the order total. It would be great if this were possible to achieve through the API as well.

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