Customization of FirstSpot

[Matze]

hello, i also want to know how to change the Voucher Printing.
all hint mentioned here does not work.

is the edituser.php the right page which i need to edit?
is it possible to add additional text, for example if a 5 Day Ticket is
printed the Voucher should show that 5€ has been paid.
When a 10day Voucher is printed the Voucher should show that 10€ were paid.

is this psossible?

thanks

[Matze]

am i right in thinking that i need the $add_days variable to build something like this?