$attrs{'error'}         = 'cancel-url and success-url cannot be de
+rived from the environment and need to be provided' unless ($attrs{'c
+ancel-url'} and $attrs{'success-url'});

    $attrs{'error'} = 'Public API key provided is not a valid key' if 
+$attrs{'api-public'} and $attrs{'api-public'} !~ /^pk_/;
    $attrs{'error'} = 'Secret API key provided is not a valid key' unl
+ess $attrs{'api-secret'} =~ /^sk_/;
    $attrs{'error'} = 'Secret API key provided as Public key' if $attr
+s{'api-public'} and $attrs{'api-public'} =~ /^sk_/;
    $attrs{'error'} = 'Public API key provided as Secret key' if $attr
+s{'api-secret'} =~ /^pk_/;
    $attrs{'error'} = 'Secret API key is too short' unless length $att
+rs{'api-secret'} > 100;
    $attrs{'error'} = 'Secret API key is missing' unless $attrs{'api-s
+ecret'};
    
    return bless \%attrs, $class;
[download]

If you must use this style for signaling an error then perhaps you should document that gettting an object back (as opposed to undef) is not a guarantee that object construction succeeded but it should check for the success() my $obj = Bod::Stripe->new(...); die $obj->error() unless $obj->success(); (I have run through the POD diagonally and I think I did not see any mention).

bw, bliako