What does it mean when the headers array in Shopify API is lacking an authorization key?

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If the headers array in Shopify API is lacking an authorization key, it means that the API request is not authenticated and it will be rejected by Shopify. The authorization key is used to verify that the request is coming from a trusted source and that the user making the request has the necessary permissions to access the requested data. Without an authorization key, the API will not allow access to any protected data or resources.