Builds configurations for Unity IAP.
Collects products and store-specific configuration details.
See Also: UnityPurchasing.Initialize.
| products | The products built so far. | 
| AddProduct | Add a product with a Unity IAP ID, type and optional set of store-specific IDs. | 
| AddProducts | Add a collection of ProductDefinitions. | 
| Configure | Access store-specific Configuration settings. | 
| Instance | Get an instance of ConfigurationBuilder. |