Cannot subscribe with American Express

Bug report

I can not subscribe the license with American Express.

Although the Security code (CVC) on the subscription form must be less than 3, Security code (CVC) of the American Express is 4-digit number.

I want to keep using this product cuz I really like it.
Let me know if you need more information. Thank you!!


  • Platform: (macOS)
  • Platform version: (Sierra/10/12.6)
  • App Version: (3.10.2)


  1. Accessing to

  2. Filling out the “Security code (CVC)” like image below (4-digit number)


Hi Teguri-san,

Thank you for considering to purchase Inkdrop!
I didn’t know there are 4-digit CVCs.
I just fixed the form to allow it, so could you try it again?

Thanks for reporting!

I’ve successfully registered. Thanks !

1 Like

Great to hear that!
Thank you for purchasing XD