I am in China, why I can not buy the premium service ?
It always said"failed", even in the app (I use iPhone)?
Please tell me - have you tried to purchase Todoist Premium directly through the web-app at http://todoist.com through a desktop computer (not the mobile browser)? Does it also fail? Does the error message you see at the Apple Store only say "failed" or is there any other information, if so - please clarify what exactly does it say?