Use an order ID to minimize duplicate conversions
Currently, refresh of purchase confirmation page counts as one conversion, and Adwords's solution to that :
Siddesh Gaykar commented
Anything similar to this will be of great use in optimizing E-commerce accounts. B'coz actual conversion & revenue no's really matters for an E-commerce website.
When tracking a conversion and the purchaser goes through the checkout page but backs back into it, it tracks multiple conversions. Work on finding a solution to fix this.