A credit card purchase is basically defined as a customer spending on a credit card. Credit card issuers often offer 0% interest
periods to encourage their product to be chosen from the huge UK credit card market. If you open a new credit card account and
have no introductory offer you will normally be required to pay back interest on everything you use your card for, this is the APR.

eg, John Smith's credit card has a APR of 12%. John spends £10 on lunch, at the end of the month he will recieve his statement
which will state that he owes the credit card company £10.10. The 10 pence is for the interest. Your APR is divided by 12 hence 12% divided by 12 equals 1, so John has to pay 1% interest back on what he borrowed. 1% of £10.00 = 10 pence.