Can I use my Mastercard at merchants that do not accept Mastercard credit cards (i.e.Costco)? May 20, 2020 23:20 Updated Yes, you can use your new Money Debit Mastercard at Costco and anywhere else that accepts debit cards. Related articles What are the benefits and features of the SoFi Money Mastercard debit card? How should I update my new Mastercard info on Apple Pay, Samsung Pay, Amazon, etc? What do I need to do before I receive my new Mastercard? Why has my Visa card stopped working? How do I get a SoFi Money debit card for the joint account?