AyeCode / invoicing

    if ( $is_ajax ) {

        // Save address fields.

        $address_fields = array( 'first_name', 'last_name', 'phone', 'address', 'city', 'country', 'state', 'zip', 'company' );

        foreach ( $address_fields as $field ) {

            if ( isset( $user[$field] ) ) {

                $invoice->set( $field, $user[$field] );

            }

            $invoice->save();

        }

        $response['success']            = true;

        $response['data']['subtotal']   = $invoice->get_subtotal();

    // Save vat fields.

    $address_fields = array( 'vat_number', 'vat_rate', 'adddress_confirmed' );

    foreach ( $address_fields as $field ) {

        if ( isset( $invoice_data['user_info'][$field] ) ) {

            $invoice->set( $field, $invoice_data['user_info'][$field] );

        }

        $invoice->save();

    }

    // Add the user data for hooks

    $valid_data['user'] = $user;