Issue #2887415 by mglaman, andyg5000: Add support for 3.x SDK Issue #2878919 by andyg5000: Refactor dropin ui javascript to include updates from new hosted fields js Issue #2872773: Refactor of commerce_braintree_js_process_transaction is bad Issue #2867875 by andyg5000: Make sure Braintree can load/create customer in cardonfile form submit callback