I'm not sure it solves your problem, but to create a hash with the keys specified in Perl, you have to quote the keys, as they aren't simple barewords: 
    fields      => { 'user[email]' => $login, 'user[password]' => $pas
+sword },

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See perlop for details:

The => operator is a synonym for the comma except that it causes a word on its left to be interpreted as a string if it begins with a letter or underscore and is composed only of letters, digits and underscores.
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In reply to Re^3: www::mechanize matchup.io form and clicking by choroba
in thread www::mechanize matchup.io form and clicking by rocteur

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