public static void Pay(
string product,
string action = "purchaseitem",
int quantity = 1,
int?quantityMin = null,
int?quantityMax = null,
string requestId = null,
string pricepointId = null,
string testCurrency = null,
FacebookDelegate callback = null)
{
FacebookImpl.Pay(product, action, quantity, quantityMin, quantityMax, requestId, pricepointId, testCurrency, callback);
}