How do I become a 3D secure merchant? Leroy Esterhuizen August 13, 2021 06:08 Updated Follow You can simply request that your Merchant Bank to enroll your merchant account for 3D Secure. Once this process has completed Adumo Online will conduct 3D Secure testing. Once a successful result has been attained your account will be enabled for 3D Secure. Related articles What is an ECI indicator? Comments 0 comments Article is closed for comments.