IOS IAP pay once, buy one item multiple times

In the game, you often need to buy virtual currency, such as: 100 Diamond Package and 200 diamond Package Two commodities, I need to buy 1000 diamonds at a time, you need to purchase 10 times 100 diamond bag or 5 times 200 diamond bag. This is the time to use the skmutablepayment.

Buy once skpayment * payment = [skpayment paymentwithproduct:_skproducts[0]];        [[Skpaymentqueue Defaultqueue] addpayment:payment];

Buy a commodity multiple times skmutablepayment *payment = [skmutablepayment paymentwithproduct:_skproducts[0]];        payment.quantity = 10;//Purchase Count        [[Skpaymentqueue Defaultqueue] addpayment:payment];

Have fun!

IOS IAP pay once, buy one item multiple times