To Billit

Below you can find all accepted header values that have a usage with the API

Header Name	Header Value	Header Usage
PartyID	INT - A party ID	To define the context
ContextPartyID	INT - A party ID	To define the context
ApiKey	"Secret ID'	To be authenticated with the API
Authorization	"Access token"	To be authenticated with the API
Idempotent-Key	"Unique client generated string"	To make unique requests
StrictTransportType	"true"	To make transportTypes strict

From Billit

Header Name	Header Value	Header Usage
Billit-Signature	String (Time +Encrypted)	To verify the webhook