What is a merchant ID? Tom Woodward May 29, 2016 14:47 Follow Each MyGate merchant is issued with a MyGate Merchant ID. This identifies the merchant on MyGate's Back Office system. Related articles What is an application ID? Obtaining Integration details in the Web Console How do I Manage my account? What do the various Web console Transaction Statuses mean? What are all the URLs for live and test modes? Comments 0 comments Please sign in to leave a comment.