Is it possible to change the hard coded SKU $new_product->sku = 'contribution_do_not_delete'; in the install module line 25.

Perhaps I don't understand how the module should be used. Went through the following process:
1. Installed & activated module
2. Created a new line line item, product type with the added field to contain contribution amount & its widget.
3. Created new product using the above line item type, new product display node & instance.

Used the product to add contributions, only the first one updated the amount field on the widget.
It looks like a new record is created in the dB for each posting, however the total for all records by all users does not seem to be computed.

Thanks,

Chaim