Authentication is managed using HTTP authentication (only “Basic” is supported right now). Every request must include the Authorization HTTP header. Use your API token as the username, and “X” (or some otherwise bogus text) as the password (only the API token is used for authenticating API requests).
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If you go to the reference docs, there is a authentication call you can follow there. This call will show you how to pass in your api key to get back your unique site details. All calls need the api key to be passed in as a header value in order to work.
Take a look at our references - Authentication call.
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