function wpf_ontraport_field( $args ) {

    if( ! function_exists( 'wp_fusion' ) ) {
        return;
    }

    $contact_id = wp_fusion()->user->get_contact_id();

    if( empty( $contact_id ) ) {
        return false;
    }

    $params = wp_fusion()->crm->get_params();

    $url      = "https://api.ontraport.com/1/object?objectID=0&id=" . $contact_id;
    $response = wp_remote_get( $url, $params );

    $body_json = json_decode( $response['body'], true );

    if( isset( $body_json['data'][ $args['field'] ] ) ) {
        return $body_json['data'][ $args['field'] ];
    }

}

add_shortcode( 'wpf_ontraport_field', 'wpf_ontraport_field' );