If you're using a cart, server, or other service that is behind a firewall, you may need to add FarApp's IPs so that FarApp can connect to your service. You should add the following IP addresses to your whitelist:
These are all the IPs that FarApp uses so whitelisting these should allow any FarApp service to connect to you.
Here are the IPs again in a comma-separated list for easy copy and paste:
If you are seeing long delays in response when you test the connection in the Settings > Credentials page for that connector or are receiving a 403 error - forbidden - this is likely because our IPs are being blocked.