Plugin Alliance does not allow stacking of vouchers. You can only use one voucher per order.
Please note that there are two different types:
1. Product Vouchers
Product vouchers that reduce the price of a specific product.
These include, for example, product intro vouchers, crossgrade vouchers, and flash-sale vouchers.
2. Cart Vouchers
Cart vouchers reduce the price of several products or the price of the entire purchase.
For example: loyalty vouchers, cash-back vouchers, Any Plugins for $29.99, survey vouchers, and gift vouchers.
If you want to change your billing date, you must cancel your current subscription and start your new one on the day you wish to be billed each month or year. We cannot manually modify the payment date.
You can find all of your benefits and vouchers in your account. Please log in here: https://www.plugin-alliance.com/pages/benefits-vouchers