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        #EXPORTABLE FUNCTIONS

...

         #verify the checksum
         if( is_valid_checksum(’01234567’) ) { ... }

use Business::ISSN qw(is_valid_checksum);

my $issn = '0742-4477';
print "Valid = " . is_valid_checksum($issn);

"is_valid_checksum" is not exported by the Business::ISSN module
Can't continue after import errors at test.pl line 1
BEGIN failed--compilation aborted at test.pl line 1.