Wouldn't it be better to integrate into the well known shopping carts? Something that bitpay did? I plan to port over all of the PHP ones into bitshares: https://bitpay.com/bitcoin-for-ecommerce
We could market it as the bitshares e-commerce section on the site.
Although I do like the fact that it gives partial completes, invalids due to blockchain reorgs and stuff and txid's of successfully completed transactions... so maybe some stuff can be borrowed here.