What is the solution for recurring payments discounts?
Recurring payments don't support multiple items.

Originally posted by @DannyZB in #55 (comment)

Trying to use Smart Buttons with the Rest API to generate tokens etc.

As multiple products aren't allowed in a subscriptions, how do we give the users a discount.

1. We can't add a negative amount product.
2. No discount/coupon parameter available.

Could you please shed some light on this.

Will we need to create a new pricing plan for every possible coupon that we provide to users? That is the only solution I can think of.

ref : Forum PayPal
Billing API

Thank you