I am a user from China and it is difficult to use google play and VISA in our place.
Have developers thought about using paypal, or alipay/wechat payment? And have you considered using a license verification method other than google play? I have purchased another app called superdisplay, and when google play doesn’t connect (which happens a lot), it changes from the full version back to the experience version, which is very frustrating for me!
