Removes coupon and promotion code parameters with stackable discountsBreaking changes

What’s new

We’re removing the singular coupon and promotion_code parameters in favor of the discounts parameter that supports applying multiple discounts.

The coupon and promotion_code parameters and fields are no longer available on Subscription, Subscription Schedule, or Preview Invoice endpoints and respective resources.

Use the discounts parameter to include one or more discounts on a Subscription, Subscription Schedule, or Preview Invoice, and read from discounts in the responses instead.

Parameters	Change	Resources or endpoints
coupon	Removed	Invoice#create_preview.schedule_details.phases[]Invoice#create_preview Subscription#create + 6 more Subscription#update SubscriptionSchedule#create.phases[]SubscriptionSchedule#update.phases[]SubscriptionSchedule.phases[]Customer#create Customer#update
discount	Removed	Invoice Subscription
promotion_code	Removed	Subscription#create Subscription#update Customer#create + 1 more Customer#update

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