Some payment gateways and payment method receivers require incoming requests to only come from white-listed IP Addresses. There are 3 ways to specify a set of IP addresses. You can use CIDR notation, you can use subnet masks, or you can list all of the IP’s. You only need to use one of the three specification methods.
Using CIDR notation
If your gateway or receiver allows you to use CIDR notation, please specify the following:
Using subnet masks
If your gateway or receiver allows you to specify subnet masks, please specify the following:
If your gateway or receiver doesn’t allow you to use CIDR notation and it doesn’t allow subnet masks, list the following IP address: