Many PSPs allow incoming requests only from whitelisted IP addresses that you need to configure on their side. If you are using optile, these requests originate from our OPG servers.
Therefore their (outbound) IP addresses need to be whitelisted. Please make sure the following IP addresses are whitelisted for each PSP you are using, depending on whether you use OPG1 or OPG2.
Also we advise you to use these addresses for IP filtering in your Notification Listener.
|OPG System||Base URL||IP Addresses|