I enter credit card purchases as handwritten 'checks' in my computer software. I show each purchase under each individual 'vendor'. When I actually pay the credit card bill, am I causing an error? It seems like this would be double paying.

For example, I buy food at Costco and use my AE card. I enter this purchase using AE as the liability account and show the purchase made using the vendor card for Costco.

Then the AE bill arrives. I make the payment but do not delineate each individual purchase shown on the AE bill.

Am I doing this correctly? I have confused myself.

At time of purchase enter the addition of the asset you've acquired and a liability towards AE.

Then enter the decrease in whatever account you pay the AE bill from (usually a checking account, but could be petty cash) and the decrease in the AE liability when you pay AE.