function wpf_true_auto_login() {

    if( ! isset( $_GET['cid'] ) ) {
        return;
    }

    if( ! isset( $_GET['key'] ) || $_GET['key'] != wp_fusion()->settings->get( 'access_key' ) ) {
        return;
    }

    $contact_id = sanitize_text_field( $_GET['cid'] );
    $user_id = wp_fusion()->user->get_user_id( $contact_id );

    if( empty( $user_id ) || user_can( $user_id, 'manage_options' ) ) {
        return;
    }

    $user = get_user_by( 'id', $user_id );

    if( ! $user->user_email == $_GET['email'] ) {
        return;
    }

    // Login
    wp_set_current_user( $user_id, $user->user_login );
    wp_set_auth_cookie( $user_id );
    do_action( 'wp_login', $user->user_login, $user );

}

add_action('init', 'wpf_true_auto_login');