How do we setup a redemption rule to only allow full purchases, not "money off" purchases.
You can make a product FREE with X points. Just create a rule that does the condition "for every Y in price, customer spends X". Set Y to the monetary divider and X to the number of points per monetary amount in the product price. For example say your rule was set to "For every [$1.00] in price, customer spends [5 points]". This would result in a $10 product costing 50 points, a $50 product costing 250 points, etc.