Purchasing products

Once the user has selected a product for purchase, we can start the checkout process.

How to do it...

When we have obtained a list of products, we can present the user with the opportunity to make a purchase. There are two ways to make a purchase, either using a Product instance or just the product ID:

1. The QueryInventoryAsync() method returns a list of:

   var products = await billing.QueryInventoryAsync(
     new [] { "managed.one" }, ItemType.Product);
   var product = products[0];
   billing.BuyProduct(product);
   

2. This method also has an overload that accepts a string payload that will be included with any server responses:

   billing.BuyProduct(product, "DeveloperPayload");

3. Another way to purchase a product is to simply pass the product ID to the BuyProduct() method along with the product type and an optional payload:

   billing.BuyProduct(
     "managed.one", ItemType.Product, "DeveloperPayload");

After the purchase has been made, we will be notified about...