Consuming purchases

Some purchases are used to indicate additional features that are not initially available to the user. Other products are consumable products and only provide a once-off feature, which will have to be re-purchased to be re-used. These products are consumable products and only provide a once-off feature.

How to do it...

Some products are meant to be consumed, or exhausted, when used; the user is required to purchase them again before they can be reused:

1. To consume a product, we pass the purchase to the ConsumePurchase() method:

   var success = billing.ConsumePurchase(purchase);

2. We don't really require the Purchase instance but rather just the purchase token. When a product is purchased, we can just store the purchase token and use that:

   var token = purchase.PurchaseToken;
   var success = billing.ConsumePurchase(token);

3. If the consumption is successful, we can use the return value, or make use of the OnPurchaseConsumed event:

   billing.OnPurchaseConsumed += (token) => {
     //...