You can link Credit/Debit cards to your Sezzle account. 

Credit/Debit card

To add a debit or a credit card to your Sezzle account, log into your Sezzle dashboard. Select "Settings" at the top, and then payment methods.

Under "Payment Methods," choose "Add a new credit/debit card" You'll then be walked step-by-step through adding your payment method. Once added, you can then set it as your default or update it for existing orders.