Drupal Userpoints for Ecommerce purchases?

I tried posting this on the issue queues at d.o. for the e-Commerce and Userpoints-contrib projects, but no response

So maybe someone here has done this, you never know

Simply put, members earn points (it is a tutoring site) for logging in, posting a comment etc. When they accrue enough points, they redeem for one of two shirts (tangible product).

The points are working with custom code in workflow-ng (because the events have to be unique each day to earn points)

Trying to use the points for ecommerce - with the userpoints_contrib module.

In Userpoints I enabled use points for ecommerce, on checkout I see use points for purchase, but the points are not deducted, purchases with insufficient points are processed -

in other words, it ain't happenin

using e-Commerce 5.x-3.x-dev (the recommended stable version) tried some 5.x-4.x versions, and 5.x-3.4 too

Userpoints_contrib 5.x-3.x-dev too

two possible alternatives:

If I make the purchase display a unique confirmation page (not accessible in other ways) I can write more custom wf-ng code to process the points (check if sufficient and reset to 0 on purchase)

I installed the COD payment module and set the confirm redirect page - but that isn't happenin' either

OR

I can try Ubercart (I tried e-Commerce first, there are only 2 products and only a few sales/mo) which is also supposed to integrate with userpoints

Any suggestions?

site (in dev) flydigits dot netsperience dot org