How do you guys deal with promotions. For example: If i want to sell a premium membership with a discount. So i make an account upgrade in the acp but what if the date is expired? Normal price for example is 20 dollar, for one month you can purchase premium for 10 dollars. Members who purchase this have the benefit of a discount price for always. You have to remove the button after the discount period is over. Will the recurring payments still work?