Add Custom Authorization Header to REST API Requests

A PHP snippet for Add Custom Authorization Header to REST API Requests.

function add_custom_authorization_header($request) {
    $headers = $request->get_headers();
    
    // Add custom authorization header
    $headers['Authorization'] = 'Bearer ' . get_option('my_custom_api_token');
    $request->set_headers($headers);

    return $request;
}

add_filter('rest_request_before_callbacks', 'add_custom_authorization_header');