Template override

Hi,
we love the plugin but we need to override the presentation as we need to add some more information (brand name, logo etc..).
We can add all those information by ourselves but we need to know how to override the php template so we don’t mess with plugin core code and we will keep the possibility to update.
Can you please give us some hint? We searched the documentation but couldn’t find anything related.
Thank you
Have a nice day.
Marco