It is just referencing the fact that braintree now accepts bitcoin, using coinbase as its payment processor.  Coinbase has two primary functions - a consumer side that serves as a wallet/way to buy bitcoin, and a merchant processing side. Braintree is using the merchant function; you are using the consumer function. Unfortunately, there is no real overlap there for you.

AFAIK, you need a US bank account to transfer money to coinbase. Coinbase don't accept paypal deposits or withdrawals due to the fact that they are easily reversible. Try virwox or the currency exchange section.