Requests will be sent with the below headers:
Freede-Verification-Key
Freede-Verification-Token
Agencies who wish to verify Freede sent the requests should perform a SHA256 hash with the Freede-Verification-Token and their API key, comparing it against the Freede-Verification-Key.
This is SHA(Token + API Key).
The token will be different on each request, so do not hard code this.
Freede further suggests to IP whitelist the Freede servers.