Access the American Express Payment Gateway
Before you perform test transactions, ensure connectivity to the American Express Payment Gateway.
If you have any IP-level restrictions, you may need to whitelist the American Express Payment Gateway IPs.
Contact the American Express Payment Gateway Support team to obtain the required IP list if whitelisting is needed.
To check the connectivity, access the following URL through a web browser:
Batch: https://gateway-na.americanexpress.com/batch/information
If the gateway processes the requests successfully, the "information" file displays status as OPERATING.