It's pretty much explained in the summary. We usually don't have VISA, American Express (that's obvious), or any other card to pay for the pro features. Thus, we aren't able to go pro, nor even get a trial period as that also needs billing details. Could the developers please add some other paying methods, such as AliPay or WeChat payment (hot paying methods in China), and possibly other ones to hopefully make any other person who doesn't have access to VISA convenient to purchase pro features? A million thanks to you.