Which cards are supported by Splitit? March 16, 2022 14:34 Updated Splitit is supported by Visa, Mastercard, and depending on the merchant, American Express, Discover and UnionPay. Related articles Can I use my debit card to pay for my monthly installments? Why do you need to authorize my card with the full amount as well as charging my installment amount? Can I use Paypal to take out a Splitit installment plan? I didn't have enough money and the authorization or payment has not gone through. What should I do? Am I able to talk to you via live chat? Comments 0 comments Please sign in to leave a comment.