Open the Sezzle mobile app and go to the "Virtual Card" tab.Click "Create a single-use card."
  Start typing to search for where you'd like to shop. If you don't find it, click "Click here to create a single-use card to pay-in-4 anywhere Visa is accepted."
  Enter the amount you'd like to spend-including shipping, tax, or tip. Make sure it's within your estimated spending power.
Review and agree to your loan terms, including service fee.
 Once created, the single-use card is only good for that merchant and will expire in 72 hours.
Once you have your virtual card, head back to the checkout page and purchase MSA like you are using a credit card with your new virtual card