If you use your debit card at a gas pump, regularly an amount will be blocked — often $75 or $100 — on your card. That amount doesn’t “un-block” as you drive away. Instead, the hold remains up to 72 hours, until the station does a “batch” transaction that lets the credit union know the actual amount.
Each big oil company has a different policy. The reasoning behind this policy is that oil companies don’t know how much gas you’re about to pump and so they earmark a certain amount of your money. While the length of the hold is up to the credit union, the amount of the hold is up to your gasoline retailer.
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