Hi Hans,
Can you clarify exactly what you mean by “invoices”? Our plugins do not generate invoices.
Share a screenshot of what you want to change, if possible! 🙂
In the meantime, I should set your expectation here that changing text and such will likely require code customizations. We cannot help with code customizations.
So I will likely only be able to show you where to change the sorts of things you want, and point you in the right direction—but you will have to take the reins on most of the changing and adding of text.
Just wanted to establish this before we continued on this thread! Share some screenshots and I will do my best to help out.
Thank you,
George