You can generate coupon codes, up to a maximum of 5000, for one or more of your paid app's distribution countries.
Customers in those countries can redeem coupons to download your paid app for free, which reduces the number of unused coupons. When that number is below 5,000, you can generate more coupons for any of your distribution countries, up to the global maximum.
You can target your promotional campaigns to countries with higher sales and can control your campaigns in different countries. You are responsible for sending coupon codes to your customers.
For more details about generating and managing coupons, see Paid Android App Coupons.