Unity - Scripting API:

public function InitiatePurchase(product: Purchasing.Product, payload: string): void;

public void InitiatePurchase(Purchasing.Product product, string payload);

public function InitiatePurchase(productId: string, payload: string): void;

public void InitiatePurchase(string productId, string payload);

public function InitiatePurchase(product: Purchasing.Product): void;

public void InitiatePurchase(Purchasing.Product product);

public function InitiatePurchase(productId: string): void;

public void InitiatePurchase(string productId);

Parameters

product	The product to purchase.
payload	Any additional developer information to associate with the purchase.
productId	The identifier for the product to purchase. This may differ from the store-specific product ID.

Initiate a purchase for a specific product.

The application will be informed of the result via their IStoreListener implementation.

See Also: Product for an example usage.