After creating a discount code, you can use it across the system by a client or by yourself during checkout.
https://s3-us-west-2.amazonaws.com/secure.notion-static.com/9f1f9428-f740-4ae2-ad55-4d674a0f2395/Simulator_Screen_Recording_-_iPhone_11_-_2021-05-12_at_21.21.30.mp4