This guide details how to connect from a calling system into the Telco Network Cloud Orchestration (TNC-O) APIs securely. Pre-requisites an existing installation of the TNC-O a valid set of client credentials which can be used for authentication. If not, see Managing Client Credentials Making an API call TNC-O uses the standard OAuth 2.0 mechanism to authenticate incoming API requests. This requires some additional tokens to be setup in the headers of any HTTPS request that is made. »