If you are thinking about purchasing a money order with your credit card, you may want to call the location of your choice first, to double-check if they will allow the transaction. Our Editorial Policies: The information contained in Ask Experian is for educational purposes only and is not legal advice. Your credit card issuer may not let you go over your limit, even if you’ve opted-in to having over-the-limit transactions processed. By Matt Tatham. Buying a money order with a credit card is possible, but is rarely in your best interest to do so. Nothing could be farther from the truth. Which card would you like to compare?