Splitit is a technology provider that enables merchants or retailers to offer monthly instalment payments to their customers by using the customers' existing credit card with no credit checks, interest, application forms or fees.
When you make your purchase the merchant or retailer takes your first installment payment.
As well as your monthy installment payments, the full outstanding purchase amount is authorized (held) in order to guarantee future payments to the merchant or retailer. These authorizations are renewed periodically (usualy every 19 days or so) and reduce with each instalment paid. As long as your plan is kept up to date, these authorizations are not charged.
For this reason, you must maintain sufficient available credit on your credit card for the full outstanding amount of your purchase during the period of the plan.
The held amount might show as ‘pending transaction’ on your credit card statement.
You can find a full list of where you can use Splitit here.