[Koha] Internal Server Eror when trying to authenticate

[Michael Kuhn]

Hi

When using Koha 16.05 we have set up a script "auth_divibib.pl" to 
authenticate against Divibib (a German company that does about the same 
as Overdrive). The script contained lines like

use C4::Members;
...
use DateTime;
my $today = DateTime->today->date;
...
my ($borr) = C4::Members::GetMemberDetails($borrowernumber);
   return("1", "0", "0") if defined ($borr->{'debarred'});
   if ($borr->{'dateexpiry'} lt $today) {
     return("-3", "0", "0")
   }

After updating to Koha 18.05 unfortunately this is no more working as 
before. We have seen in Bug 
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17578 there 
was a change in C4::Members so we tried to change 
C4::Members::GetMemberDetails to C4::Members::GetMember in the code. But 
still the file throws an "Internal Server Error" in the browser and the 
following error appears in file "plack-error.log".

Variable "$today" is not available at 
/usr/share/koha/opac/cgi-bin/opac/auth_divibib.pl line 164.
Undefined subroutine &C4::Members::GetMember called at 
/usr/share/koha/opac/cgi-bin/opac/auth_divibib.pl line 158.

Can anyone give us a hint how to solve that problem?

Best wishes: Michael
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