AMEX Card - getting response code 3 - this transaction cannot be accepted

[daman21]

Testing out a AMEX transaction with a valid AMEX card of amount $1.08 and its giving this transaction cannot be accepted? Why would it do that?

[RaynorC1emen7]

Was answer on your other thread

https://community.developer.authorize.net/t5/Integration-and-Testing/Trouble-with-getting-response-b...