AyeCode / invoicing

    $items              = $invoice->get_items();

    $invoice_currency   = $invoice->get_currency();

    if ( !empty( $items ) && is_array( $items ) ) {

        foreach ( $items as $key => $item ) {

            $items[$key]['currency'] = $invoice_currency;

            if ( !isset( $cart_item['subtotal'] ) ) {

                $items[$key]['subtotal'] = $items[$key]['amount'] * 1;

            }

        }

    }

    return apply_filters( 'wpinv_get_items', $items, $invoice_id );

}

    $invoice_currency = $invoice->currency;

    if ( ! empty( $cart_details ) && is_array( $cart_details ) ) {

        foreach ( $cart_details as $key => $cart_item ) {

            $cart_details[ $key ]['currency'] = $invoice_currency;

            if ( ! isset( $cart_item['subtotal'] ) ) {

                $cart_details[ $key ]['subtotal'] = $cart_item['price'];

            }

        }

    }

    return apply_filters( 'wpinv_get_cart_details', $cart_details, $invoice_id );

}