Empower uses Bearer Authorization header to authenticate api calls. To authenticate you need to add an Authorization header with the contents of the header being Bearer sk_xxxxxxxx where sk_xxxxxxxx is your API Key. 
Authorization: Bearer sk_xxxxxxxx

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Create an api key

To query deployed model, you need to first have an api key, you can use the default created api or create a new one from the api key management page.
Note: All the api keys are shared across the organization.