Yes. The App generates valid invoices including all the legal informations.
5. How to get my logo URL?
There are several ways of getting your logo URL.
The easier way is to right-click the image you want (such as your front store logo) and select "copy image location" and then go to the module configuration, right-click the logo fields and select "paste".
If your image is not already hosted, you can search for an hosting service, there are countless on the web. Here are some exemples :
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