Why do you need to authorize my card with the full amount as well as my regular installment payments? August 04, 2023 12:36 Updated The full outstanding purchase amount is authorized to guarantee future payments. Find out more about authorizations and payments here. Related articles What's this about authorizing the full amount outstanding on my installment plan? I’ve just made a purchase using Splitit. What happens now? Can I use my debit card to pay for my monthly installments? Do I need to pay anything up front? What repayment options are available? Comments 0 comments Please sign in to leave a comment.