Why is there a pending authorization shown in my PayPal activity for my Pay in 4 Transaction?

When making a purchase with Pay in 4, we will conduct a pre-authorization hold on your specified card for an amount equal to the initial down payment or one fourth of your total purchase amount. This will show as a pending authorization within your PayPal Account Activity and also at your financial institution. Once you complete your purchase with Pay in 4 and the merchant ships your goods, the pending authorization will be removed and the initial down payment will be withdrawn from your specified debit or credit card. If you do not complete your Pay in 4 transaction, the pending authorization will be automatically voided by PayPal within 72 hours of the pre-authorization hold.