Unique API key is generated for each access user.
The API key should be sent in the header of every request you made to any endpoint:
Authorization Bearer: NTHgbr78pEDt0MyJWRs9GqE2H6WmcVX
API keys are supposed to be a secret that only the client and server know. So it's very important to keep you API key in secret and make all requests revealing API key on the backend.