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I run a business that takes recurring payments in the form of subscriptions monthly via paypal and credit cards through paypal. I need help designning code or applying software that help me do two things: 1. allows my new customers to use promotional codes to get a discount on their first month 2. Since I can only sell a limited amount of subscriptions, i need software/code that will keep track of my subscription and when some one cancel allow for a new customer to purchase there spot. Can someone help?