I am interested, if user of In App Billing Android app can buy multiple copies of the same in app product with one click of " Buy " button. For example, if the product is " Gold coin ", can we buy 2 coins at once? Or we need to process buy flow twice?
You cannot buy two items at once from google in App Purchases, its not supported. You can however bundle those multiple items and present it as a single item. Like make a bundle of 2x Coins