Sinch uses Access keys (tokens) to authenticate users. These tokens can be obtained from an OAuth2 token endpoint, which supports the client_credentials flow where a client_id and client_secret are used to authenticate the calling party.
An access key is comprised of:
KEY ID - The client_id is referred to as KEY ID and is your API key. When sending a call through the API, it lets us know which account to bill.
KEY SECRET - The client_secret is referred to as the KEY SECRET and is an extra layer of security which is only visible when you create an access key.
When you create an Access key, note down your KEY SECRETcarefully as this is only displayed when you create the Access key.If you lose your KEY SECRET(formerly called the secret ID) you will need to generate a new access key.