As a customer, Once you have entered your PIN number to log in, you will have the ability to add or update a payment method via the Payment Methods section of the menu. As a BlytzPay user, you can store as many payment methods as you like and use them to pay your invoices as you see fit.
As a Merchant, There are 2 different areas where you can add a payment. The first option is to select the save payment method option when taking a payment. The second option is to click on the Payment Method tab, this method is best used when adding a card for setting up AutoPay and not when you want to take an immediate payment. In either scenario, the card is saved with the customer's account where they will also have access to use the saved method.