Hmm...I don't see anything 6 confirmations on Coinbase at Point of Sale:
https://www.coinbase.com/docs/merchant_tools/point_of_saleDon't see anything about 6 confirmations on Coinkite Point of Sale, neither:
https://coinkite.com/faq/terminalHow does this work out with confirmations, would the consumer have to wait 10 minutes?
We can immediately confirm amounts from customers that are using Coinkite's accounts, and in other cases, we offer the choice to the retailer as to how many confirmations they require. We feel that if you are transacting small amounts, then accepting zero confirmations (for instant payment) may be a reasonable risk.
Oh well...fudsters gonna fud.