First of all, you need a TWINT business customer account. If you don't have one yet, please create an account here.
Do you have an account? Great, then you can start with the configuration!
Log in to the TWINT Dashboard.
Choose that you want to integrate TWINT in an online store.
Choose one of the three possible TWINT options. The express checkout option is not yet supported by Shopify and WiX. We therefore recommend choosing the first option.
Select "Shop-Plugin" and then - important! ->
a) for Shopify Shops "Shopify via PEND".
b) for WiX Shops "WiX via PEND".
Enter a password for the merchant certificate. This certificate will not be needed later.
Enter all necessary information and click continue.
Fill in the rest of the info and click next.
Check all your entries and then click on "Submit order".
Now you can link your store in your PEND Account and install TWINT directly from there.