How do I get a static IP and register it?

You can buy a static IP from your internet provider, or run your code on a cloud server with a fixed public IP. Then add it on the API dashboard.

There are two slots, primary and secondary. Use the secondary for a backup connection. Both IPv4 and IPv6 are supported.

Register the public IP your traffic actually goes out from. It's often different from the IP shown on your computer, so check it from the machine that runs your code.