Create Category through API not shown in the EpiServer Commerce portal. I am using CatalogImport class implemented in below link.
One more thing, I get the object back through API with GetCatalogNode(productCode). Any help appreciated. Thx!
After you created the new Category through code, can you see the new node in Commerce Manager? If so then go to the CMS and see if you can point it out on the product listing page.
If that doesn´t help please try to be a little bit more specific on how you have designed your menu for the site. Maybe there is something wrong in the way you build up you menu items on the portal/cms site.
Check the Languag settings also please.