gold3n | Stripe Developers | Page 1

Right now I don't think we support promotion codes for one-off Invoices - you'd have to apply a coupon instead https://stripe.com/docs/api/invoices/update#update_invoice-discounts-coupon

Stripe API reference – Update an invoice – curl

Complete reference documentation for the Stripe API. Includes code snippets and examples for our Python, Java, PHP, Node.js, Go, Ruby, and .NET libraries.

#gold3n