With the latest update partners can call setDiscount with a discount code created in Admin -> Discounts as an Edit Cart action for merchants who have Shopify POS Android v3.1.3 and POS iOS v5.2.1 installed. Learn more about it here.
We encourage you to try setting cart discounts with a code. We’d love to hear your feedback and how you’ll use this in your app. If you have any suggestions on how we could improve usage, please let us know. All comments are welcome!
If you have any questions or need further clarification, don't hesitate to reach out to the team at email@example.com or reply in the thread below.