A specific, non-obvious item that should be included on a pre-integration checklist for clients regarding their network configuration for outbound OTP API calls is the precise identification of the public egress IP address or addresses that their outbound traffic will use. When a client's internal server initiates an outbound OTP API call, the source IP address that the external OTP service provider observes is not typically the server's private internal IP address. Instead, in most corporate networks, the server's traffic first passes through a network device such as a firewall or router that performs Network Address Translation (NAT) or Port Address Translation (PAT). Network Address Translation is a method of remapping an IP address space into another, allowing multi....
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