do_action in API call

Question

I have a woocommerce plugin and it provides an API url ?wc-api=myplugin.

The plugin adds a new email also.

function add_newstatus_woocommerce_email( $email_classes ) {
  require( 'emails/class-newstatus-email.php' );
  $email_classes['WC_Simplepay_Success_Email'] = new WC_Simplepay_Success_Email();
  return $email_classes;
}
add_filter( 'woocommerce_email_classes', 'add_newstatus_woocommerce_email' );

In emails/class-wc-simplepay-success-email.php I add an action in the constructor.

add_action( 'woocommerce_order_status_newstatus', array( $this, 'trigger' ) );

How can I use do_action to run this action from the plugin file? This does not seems to work. I guess it does not see that action.

do_action('woocommerce_order_status_newstatus');