Sage 50 is telling me that my Merchant ID and Merchant Key are invalid. What should I do?
If you are having difficulties saving your Merchant ID (MID) and Merchant Key (MKEY) in Sage 50, please begin by reviewing Setting up Sage 50 for credit card processing to verify the correct procedure is being followed. For example, a common source of error is the MKEY, which is case-sensitive and always alternates between letters and numbers.
If Sage 50 continues to tell you that your information is invalid, please remove your MID and MKEY entirely and press 'Save' with nothing entered. After saving, re-enter your credentials. If you are copying and pasting from an email or document, please type the information in manually. Press 'Save' when complete.
If you have questions or require additional information, please submit a ticket and we will be in touch with you shortly.