Can I pay by credit card after I have already been issued an invoice? Erryn Updated July 18, 2019 23:09 Follow Invoice Payment Options Yes you can. Once you receive your invoice, payment by credit card will be available. Related articles What methods of payment do you accept through the OETC Shop? How do I send my cart to someone else? How to access your purchase history in the new OETC store How do I purchase from the OETC Shop? Will I get charged a fee for using a credit card (or p-card) to purchase?