I get a 0 after the result of my ajax requests

WordPress does that by default at the end of admin-ajax.php. It kind of assumes you’ll use one of wp_send_json(), wp_send_json_success(), or wp_send_json_error() to communicate your process’ state (or at least terminate the script yourself). All of those use wp_die() to terminate the script after sending the response. It’s sort of a catch-all response.

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