When did I ask Google to read my purchase details
kanoki.org
kanoki.org
Despite their efforts to be more transparent about what they are collecting, I'd still say that Google has gone full-blown anti-"don't be evil" these days due to the coercive way that they try to convince users to allow them to collect the data they want.
I love this feature since the data is already in gmail and they're breaking it out into a more visible location. I wish it was complete (it misses a lot of purchases) and accurate (it doesn't handle cancelled purchases well).