Include a header called x-api-key in your requests to authenticate them and have the value be one of your automorphic API keys 
'x-api-key': '<INSERT_YOUR_AUTOMORPHIC_API_KEY_HERE>'

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API Key

In order to use the API, you need to create an API key. You can create multiple keys for different purposes. For more info on how to create an API key check out Create an API key.