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Dynamics AX Payment Services Error Validating: “Check user account settings, Failing validation with DOPS(20002)”. 

The failing validation can be one of two things.  First, have you created a System User in Dynamics Online with the public key from this payment service configuration.You will also need to add the “payment – user” role to that system user account. The other possible issue is that the URL (https://paymentservice.dynamics.com/dlpaymentservice.asmx)is blocked by the Firewall...Read more