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ACE Client must handle a referral. Check the box Manage Referral with ACE in Setup→Transaction tab. Issuer response ARC must be in phase with the referral response selection. On authorization request a referral pop up will appear in ACE Client.
Online Proc 75, Online Proc 76, Online Proc 81
These tests are requiring an online PIN after going ONLINE with an 0x31, 0x33 ARC issuer response. It’s a level 3 feature. These tests are waivable by AMEX (Jan 17, 2020).