In your code you write a subroutine that HTML::Pager calls to get the data, and this is called a "callback function".

In your example it is this:

  
# create a callback subroutine to generate the data to be paged
my $get_data_sub = sub {
     my ($offset, $rows) = @_;
     my @return_array;

     for (my $x = 0; $x < $rows; $x++) {
        push(@return_array, [ $row ]);
     }
     return \@return_array;
}
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Now this is just the stub function frrm the example in the documentation. You don't want that to return a few numbers here, but real data from your database.

So you have to change your callback function:

my $get_data_sub = sub {
     my ($offset, $rows) = @_;
     my @return_array;
    
     # Prepare SQL query:
     my $sth = $dbi->prepare("Your SQL here that fetches the data from
+ $offset to $offset+$rows");
     $sth->execute($offset, $rows);
     
     while (my $array_ref = $sth->fetchrow_arrayref){
         push @return_array, $array_ref;
     }
     return \@return_array;
}
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The only thing that's left for you now is to figure out your SQL (a small hint: use placeholders as explained in the DBI documentation).