Third-Party API Allow-Listing

A vendor requires you to provide the public IP addresses permitted to call its API.

Register a dedicated IP with the provider

Keep the registered address when workloads move

Avoid updating allow-lists after infrastructure changes

Payment & Financial Integrations

Payment processors, banks, and financial-service providers may restrict API access to approved source IPs.

Give integrations a consistent outbound address

Separate connectivity identity from application hosting

Reduce IP-related deployment coordination

Enterprise customers sometimes require traffic from your service to originate from addresses they have explicitly approved.

Provide customers with a stable IP to allow-list

Keep customer firewall rules simple

Use a dedicated public identity for the applicable workload

Partners and older business systems often use IP restrictions even when modern authentication is also present.

Connect to IP-restricted SFTP or partner endpoints

Maintain a predictable source address

Avoid tying access to one server or hosting provider

Applications may move between servers, clusters, regions, or infrastructure providers while external integrations still expect the same source IP.

Preserve outbound identity during migrations

Decouple application placement from public IP identity

Reduce external coordination during infrastructure changes

Some organizations need more than outbound identity and want selected services reachable through a known public address.

Optional inbound connectivity where required

Keep the public endpoint separate from workload location

Apply it only to services that actually need inbound access