Hi Sven,

Using Odoo Online, custom modules other than data modules (consisting of only .xml, .js, .css and .scss files) cannot be installed. 

If you require any new behaviors that would usually be added by extending models, there are some workarounds possible using automated and server actions.

Importing data modules doesn't provide a lot of feedback. Usually, if you get redirected to the main Odoo page, your module was imported without any issues. Otherwise, you'll get an error message indicating the source of the problem importing your data module.

Hi,

You cannot install custom modules on Odoo Online (the SaaS version hosted at odoo.com), even in a test environment. Paid users do get support, but Odoo support does not help with custom code. They will help if you face an issue with a standard feature or an official app.

Hope it helps

I have some python scripts. I need a import Modul to get my listed products and order from ebay.

Don´t understand that Odoo don´t have a eBay Connector Modul