[support] paypal module/s

[Roger]

We have the commerce and paypal modules set up and working in drupal 7.

As a non profit organisation we cannot legally charge attendance for 
events but can request a donation which may be equal to, more or less 
than the suggested donation.

The Commerce module seems to only permit fixed pricing in the 
/store/product section.

I can set up other content types and cck fields to permit attendees to 
enter their donation, name and details but cannot find any way to send 
the details or payment to Paypal.
Has anyone seen a module that may allow us to do this please.

Or alternatively is there a way to send the reservations details stored 
by Drupal to paypal so that we can do reconciliation of the Drupal data 
to the paypal receipts.

Thanks
in advance
Roger