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? Why has my Visa card stopped working? Can you expedite the arrival of my SoFi Money Mastercard debit card? How do I get a SoFi Money debit card for the joint account? Can I earn SoFi Rewards Points for logging into the SoFi app?