Information about how you can secure your postback endpoint from unauthorized access.

IP address whitelist

Vendo will only send postbacks from a limited list of IP addresses.

The IP addresses are listed here:

If you receive any postbacks from other IP addresses, first check if this list has been updated. If it has been updated, change your IP whitelist accordingly. If the IP address you receive postbacks from is not listed, you may ignore the request (and ban the IP).