1. Head over to your Payrexx dashboard. Configure your payment providers under the 'Payment providers' dashboard option. Here you can configure TWINT by clicking on 'Configure.'
2. Enter your Store UUID.
3. Now you have the details to integrate TWINT in Zappter. Move on to Zappter admin.
Integration settings in Zappter:
1. Admin > Settings > Twint by Payrexx.
Allow Insecure Payments: In some cases, Twint does not provide feedback about the payment until much later. This results in your app users not being able to proceed and not being able to submit the order. To enable this anyway, you can activate this setting, the user confirms that he has paid although we have not yet received a response from Twint.
Twint PSP Number: The default PSP Number for Twint is 17 (Payment Service Provider number). You may need to change it depending on if there is any change on Payrexx. Check here to make sure: http://developers.payrexx.com/docs/miscellaneous