If you have a discount code for Datacake Billing, then you can enter it while creating a device to use the code to pay for the device.
Simply enter the code in the following input field:
Next press on "Apply" to enable the code. If the code is valid, a new Plan will appear in the List of choseable plans. Select this and press on "Add 1 Device" to add the device based on the discounted device subscription plan.