Pipes Network Clog Death is more universal than life; everyone dies but not everyone lives.

Google Purchases

I stumbed across some links that provide information about Google's Purchasing system today.

By running a simple search in google like "site:www.google.com inurl:purchases"

I got a list of results of files including the help files to go along with Google Purchases, and several links I found off of those which appear below.

https://purchases.google.com/termsOfService?type=Buyer
This one mentions "Google Payment Corp.", which I found to be interesting.

http://www.google.com/support/purchases/bin/topic.py?topic=7347
This specifically says that you can purchase items through your google account.

https://purchases.google.com/
This link is labeled "Purchase History" on one of the pages I found..

http://www.google.com/support/purchases
This is the general help file for Google Purchases

www.google.com/purchases
https://www.google.com/purchases
Both of these redirect to the "Manage your account" page for now. Hmmm...

The thing I don't understand, is it only mentions using Google Purchases for google services, but it talks about rating a buyer/seller (maybe for Google Base?).

I found these other google links which I am curious about as well:

https://www.google.com/accounts/ServiceLogin?service=mail<mpl=googlemail
I think this is either for whatever country can't use "gmail" or just an old link

https://www.google.com/accounts/ServiceLogin?service=sierra
https://www.google.com/accounts/ServiceLogin?continue=https%3A%2F%2Fwww.google.com%2Fpurchases&service=sierra
sierra?
But I'm not sure what this "sierra" service is. Anyone know about this?