If CoCart-API-Cart-Key header is not returning then you need to enable CORS so that the header is exposed. Either enable CORS support via a filter shown below or simply install CoCart CORS plugin for quicker activation. That’s it.
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The cart key (if not manually set), can be found via a few methods…
This feature is designed to transfer the cart over to the native version of your store. It allows the customer to continue shopping or checkout what they already have in the cart added via your decoupled store.
For more handling over CoCart for your store or a clients store, you will find that using the wp-config.php file is the best place to setup certain conditions.
CoCart CLI offers the ability to manage CoCart via the command-line, using WP CLI. The documentation here covers the version of WC CLI that started shipping in CoCart v3.0.0 and later.
What you see when you return the cart contents is how WooCommerce formats the data. However, via the REST API this particular key is not a requirement.