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  1. or download this
    # Was if ($$user_hash{SERVICE}->{$service}){
# Equivalent to if (${$user_hash}{SERVICE}->{$service}){
if (exists $user_hash->{SERVICE}{$service}) {
  2. or download this
    # Was my @users = @$user_hash{SERVICE}->{$service}->{USER};
my @users = @{ $user_hash->{SERVICE}{$service}{USER} };