This night, Printoid Premium has experienced some issues with Google Play: the app gone offline for an unknown reason.
I’m trying to do all my best to fix that. You can continue to send me e-mails to get the promo code if you had purchased the Pro version before the 7th of November, 2016. I’ll answer you as soon the app will be online again.
I’m sorry for the inconvenience, thank you for your patience!
[EDIT] 7th of November, 2016
Printoid Premium is now back online!