What is a merchant ID? Leroy Esterhuizen August 13, 2021 05:59 Updated Follow Each Adumo Online merchant is issued with a Aumo Online Merchant ID. This identifies the merchant on Adumo Online's Back Office system. Related articles Where can I find sample code for Enterprise with 3D Secure? What is an application ID? What is a UCI? Why are the card details hashed? Comments 0 comments Please sign in to leave a comment.