Merchant Support Questions & Answers Is STAN unique? STAN is a 6-digit number that is unique only for 24 hours after purchase. Therefore, STAN + date (timestamp) is unique. Last Updated: 4 years ago in Questions & Answers Did this article answer your question? Related Articles Error code 2038 Brand and logo guidelines for supported payment methods I didn't receive "Forgot password" e-mail Add new currency Supported currencies What is Open Banking?