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I have used an unattended petrol pump and I don’t understand the transactions in my pending list.

Since the retailer doesn’t know how much you plan to use, some will authorise a small amount, such as £1 to check that your card is valid.

Others may ‘reserve’ up to £100 and then reverse it and replace it with the final amount pumped when you have finished filling up. You may see these transactions in your pending list if you have used an unattended petrol pump.