Yes this module does have some problems. I haven't seen the encapsulate problem, that should encapsulate the info in whatever you set it to. I also don't see this line in AuthorizeNet 3.13 (latest version), perhaps you have a different version of it?

Also I don't see where the name field is required, and the module adds the x_ and the proper name for AuthorizeNet for you (since adding a x_ to all the params is annoying and seems unnessicary). They also don't exactly coorispond, I think the idea is to make all the OnlinePayment modules similar.

Anyway, with the newest version, I had some problems with a missing parameter and sometimes AuthorizeNet was returning '*' characters around the fields along with the encapsulation. I wrote a small patch that fixed these problems and sent it to the authors. I don't believe they have released a new version since however.

Make sure you have the newest version and put in the patch see if it works for you :)

--- AuthorizeNet.pm.org 2003-08-28 14:56:03.000000000 -0500
+++ AuthorizeNet.pm 2003-08-28 14:52:51.000000000 -0500
@@ -83,6 +83,7 @@
         type           => 'x_Method',
         login          => 'x_Login',
         password       => 'x_Password',
+       merchant_email => 'x_Merchant_Email',
         transaction_key       => 'x_Tran_Key',
         action         => 'x_Type',
         description    => 'x_Description',
@@ -179,6 +180,10 @@
     my $csv = new Text::CSV_XS({ 'binary'=>1 });
     $csv->parse($page);
     my @col = $csv->fields();
+   
+   # AuthorizeNet seems to be returning * * around
+   # the fields
+   foreach(@col) { s/(?:^\*|\*$)//g }
 
     $self->server_response($page);
     $self->avs_code($col[5]);
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