A promotion code is a checkout feature, that enables you can create customer-facing codes that can be applied during payment.
Some of the basic parameters of a promotion code are:
Discounts for the item in percentage
Discounts for the item in fixed amount
When a promotion code expires
Number of times customers can redeem a promotion code for a recurring plan. By default the limit is set to 1.
Number of times the promotion code can be redeemed for each subscription.
Minimum amount to apply promotion code.