Data sent to mondido does not handle variable products

[Icarleug]

The SKU sent to mondido is based on the product and does not include variations.
If you need to use the SKU (see my other issue about wpml compatability) it would be better to replace

$product = wc_get_product($item->get_product_id());

with

$product_variation_id = $item['variation_id'];
// Check if product has variation.
if ($product_variation_id) {
$product = wc_get_product($product_variation_id);
} else {
$product = wc_get_product($item->get_product_id()));
}

in function get_items in class-wc-mondido-transaction

If not changed you will not get the separate variations correct during the callback.