Ok, you misspelled retrieve twice, but that isn't the main problem. To pass a hash, you have to pass its contents:
return (%dat);
return ('user' => "ironcom", 'password' => "password");
--
%dat = retrieve->gather();
Or pass as a reference and then either use from the reference or dereference:
return \%dat;
--
%dat = %{retrieve->gather()}; print $dat{'user'};
$ref = retrieve->gather(); print $ref->{'user'};
I would personally go with the reference method or passing the data directly.
Oh yes, and your module will give errors if you don't end it with a returned true, whatever the heck that means. Add the following to the end of your module:
1;
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