Getting "A6 - Illegal Action" when adding Amex for Chase Gateway

[Robert]

Problem: I'm getting the below error when trying to add American Express for Chase Paymentech Orbital Gateway.  

Error: A6 - Illegal Action

[Robert · Accepted solution]

Answer: American Express under Chase Gateway requires a minimum of $1.00 authorization. Anything less will ellicit that error. You will need to go into your Zuora Gateway settings and change your "Authorization Amount" to at least $1.00.