Figure out how to make the buying process smooth (the less steps the better — Why do you think Amazon came up with a patented 1 - click purchase button?). (dealsagar.com)
Developers have also made it incredibly easy for you to do so, as long as you have a credit card attached to your iTunes or Google Play account a simple tap of the confirm in app purchases button can be done in the blink of an eye. (dualpixels.com)
Kristin from Lovely Apidae just purchased the button down top with birds on it for nursing. (gnomelover.com)