On this website there is one payment gateway.  Through this secure and reputable third party gateway you have multiple choices when it comes to payment.  This website partners STRIPE Payments Services as the third party payment  processors to give you the most secure options to pay. The following bank cards are accepted:

Cards Accepted

Credit / Debit Cards : VISA, Mastercard,  American Express

Wallets : Google Pay, Apple Pay

In addition to Stripe payment gateway, a well known express payment methin TWINT is also available for customers based in Switzerland. 

https://stripe.com/en-ch/payments/payment-methods

https://www.twint.ch/

You can follow more from the institutions original site as stated above.

Your card may be rejected for several reasons :

• The card has expired. Check if the expiration date of your card has not expired .

• The limit of your card is reached. Check with your bank to find out if the maximum threshold for purchases has been exceeded.

• One of the information is wrong. Check if you have completed all fields correctly.