pay_node requires submitting forms twice

If you use pay_node to append a form to an existing node, the form generated has a form_id of "pay_node". This posts a the URL /node/XX/pay when submitted. The callback handler for /node/XX/pay calls drupal_get_form('pay_node_pay_form', $node) which generates a form with form_id of 'pay_node_pay_form'.

The net result is that if you have an embedded pay form, no matter what you enter into it, when you click "submit" it leads you to a new copy of the form which is empty.

I'm not sure what the best fix for this would be, but as an interim this patch is working for me (although it obviously disables the ability to use themes):

--- pay_node.module 2010-11-01 18:13:52.000000000 -0700
+++ pay_node.module.new 2010-12-21 21:39:11.000000000 -0800
@@ -97,7 +97,7 @@

$node->content['pay_node'] = array(
'#type' => 'markup',
- '#value' => theme($theme, $node->pay_form),
+ '#value' => drupal_get_form('pay_node_pay_form', $node),
'#weight' => $weight,
);
}