Koongo: Sell on Marketplaces

Do not use this app for Zalando. First of all, when you connect and sync, it will convert product SKUs to product IDs from Shopify. Why? Because that's better according to the support. It does not matter that your products on zalando are added by SKU and zalando requires you to add products with SKUs and specify SKUs on documents added to the shipped order. Secondly, you wait a very long time for support responses. Third, Koongo is able to completely mess up the prices of products, by doing so, it swaps SKUs with other products. I was waiting 24h for the support to correct SKU's so it will show correct prices on Zalando. I told them that I will leave bad opinion if the won't help. And I had to change it on my own :-)
Fourth most important, it is unsuitable for syncing orders from Zalando, because there is no way to send a return shipping number back to Zalando. What is mandatory. The support has no idea how Zalando works, they keep asking about things they should know if they offer to sync your store.

The application is quite complicated, if you manage to set it up it works quite well for syncing stock and prices. But for just one functionality it is way too expensive.

Strange it doesn't work for me. :( I installed the Bol.com version, then after that I've got directed to Koongo, and have it installed that. The Bol.com version disappeared from my apps. And, with the new version while it was installed to my store, I was unable to do anything at all.