Redeem Promotional Codes - Customer Service

Promotional codes can only be redeemed at the time you place an order.

Discount codes - Gumroad Help Center

How to Redeem Promo Codes? - Voucherify Support

How To Find Promo Codes — The Expert's Guide

Set up offer codes - Manage subscriptions - App Store Connect

Where Can I Redeem a Promo Code? — Highrise - Your Avatar

12 email coupons examples that win customer loyalty - Email

ASOS Promo Codes ASOS Customer Care

Asking support for a promo code before placing your order can save

How do I set up a discount code? – Bandcamp Help Center

Discount codes - Gumroad Help Center

Android Developers Blog: Create promo codes for your apps and in