How to filter wpcargo email recipients

Filter hook in assign shipment for client.

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add_filter( 'wpcargo_assign_email_recipients', 'custom_wpcargo_assign_email_recipients', 10, 4);
function custom_wpcargo_assign_email_recipients( $recipients, $post_id, $user_id, $designation ){
    $recipients .= ',emailtest@gmail.com';
    return $recipients;
}

Filter hooks in shipment change/update status for client.

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add_filter( 'wpcargo_client_email_recipients', 'custom_wpcargo_client_email_recipients', 10, 3 );
function custom_wpcargo_client_email_recipients( $recipients, $post_id, $status ){
    $recipients .= ',emailtest@gmail.com';
    return $recipients;
}

Filter hooks in shipment change/update status for admin.

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add_action( 'wpcargo_admin_email_recipients', 'custom_wpcargo_admin_email_recipients', 10, 3 );
function custom_wpcargo_admin_email_recipients( $recipients, $post_id, $status ){
    $recipients .= ',admintest@gmail.com';
    return $recipients;
}
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