Modx: Paypal IPN & Formsave Integration

I need a snippet in Modx to receive a Paypal Instant Payment Notification and enter the information associated with that purchase into a table in the FormSave extra. Similar to how FormSave creates a new table for every new form submitted, this would need to create a new table for every new product confirmed as sold (not pending confirmation). This way more products may be added later by simply dropping in a paypal button into the site, without the need for more programing. The only parameter of the snippet would be to enter in a comma delineated list of specific variables to retrieve from the purchase. Example: [[paypalConfirm? data=`first_name,last_name,address_state`]] Each specific variable given it's own field in the FormSave table that is created. This would require the use of Modx native functions so as to be database agnostic and easily ported from one installation to the next. No transport package required.