How can I pay for SimDif Smart or Pro outside of the App?

How to pay for SimDif Smart or Pro on the web

If you are having problems paying with GooglePlay or Apple iTunes / AppStore, there are other solutions available:

Login into your SimDif site with a web browser, on a phone or a computer:
https://www.simdif.com

Go to "Upgrade or Renew" and you will see the alternative payment methods we offer.

Watch the tutorial video:
How To Pay For Smart & Pro On The Web