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my $allusers = [ {
                  'user'      => 'Sarah',
...
                  'duration'  => 5,
                  'amount'    => 500
               } ];

$allusers = [ sort { $a->{'user'} cmp $b->{'user'} } @$allusers ];
            
...
      
   }
}

my $allkeys;
for  ( @{ $allusers } ) {
...
               };
   push @{$finalArray}, $hash;
}

print Dumper ($finalArray);
$VAR1 = [
...
            'duration' => 7
          }
        ];