What is a merchant ID? Darrel Golden June 25, 2019 13:30 Updated Follow Each Wirecard merchant is issued with a Wirecard Merchant ID. This identifies the merchant on Wirecard's Back Office system. Related articles What is a terminal ID? What is my Merchant ID and how do I find it? What is an application ID? What is a referral URL and how do I add one? Which application ID should I use for 1 Click? Comments 0 comments Please sign in to leave a comment.