May be not so fast I am afraid.

https://www.paypal-community.com/t5/PayPal-Forward/Braintree-Brings-One-Touch-Payments-to-the-People-and-Will-Offer/ba-p/872921
"With Braintree’s new partnership with Coinbase, merchants and developers that have integrated with Braintree’s v.zero SDK will be able to easily begin accepting bitcoin in the coming months, enabling their customers to pay with the alternative currency across their favorite apps."

It seems the function will take a few months to be ready.