I just got an email saying that my Bing cashback for an Endless purchase was rewarded thru Amazon payments. I did not request this. I don't even know what this is! Since I was skeptical I didn't click on any links in the email but went to my Bing account. Sure enough it says that they sent my $$ thru Amazon payments. From what little I've read so far, it seems similar to Paypal. Hmm. I don't want ANOTHER account!
https://payments.amazon.com/sdui/sdui/bingcashback