Please open your TWINT app, tap the three dots or lines in the top-right or top-left corner, then tap "Loyalty cards & offers" and “Loyalty cards”. Now, tap the plus symbol (+). Here, you can save your loyalty cards, such as the Coop Supercard or the Migros Cumulus card.
If you have a loyalty card that needs to be presented at the checkout, take the steps as described here when making a payment. In the case of cards that do not have to be presented at the checkout (e.g. Coop Supercard), in future you will automatically enjoy the corresponding benefits when you pay with TWINT at participating stores.
If you use a TWINT app other than the TWINT Prepaid app, the procedure may differ slightly. If you have any questions, please contact the customer service of your TWINT app directly.