All API endpoints are authenticated using Bearer tokens, a new token can be generated using the Create new Access Token endpoint with your Client Credentials(client_id + client_secret). After that supply the Bearer authentication header of the form Bearer <token>, where <token> is your auth token. 
Authorization: Bearer <token>

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Client Credentials

At this moment you can’t manage the Client Credentials in the UI yourself. Therefore if you need a new set of credentials or you want to delete/deactivate an existing set please contact the Setle team. This is an example Client Credentials set that you will receive: 
{
    "client_id": "875307d2-88ce-44bb-a825-66a8a6cc3c97",
    "client_secret": "e31b54d7c68963f7b8248253bcdf6b12e4374d3f498d32e44810af03c1430f1c"
}
It is possible to create multiple sets per environment if desired.