When running the PayPal subscription extension, you might have some users you want to give a free account to. Or you might want to offer a discount to users with a specific code. Here is are some code snippets that will allow you to validate a promotion code in the registration form and if it is valid, either bypass the PayPal process (for a free subscription) or apply a discount.
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About Chad Butler
Chad Butler is both a freelance writer and web developer. He has developed several popular WordPress plugins, including WP-Members and his writing has appeared on forbes.com, sfomag.com, and investopedia.com.