1) is the payment gateway for paypal check out . paypal standard and braintree paypal is one and the same, a single one or three different gateways, distinct from each other.
2) I click on "paypal checkout button" (rectangular golden colour), it leads me to the paypal account login page, but while i click on the "checkout button"a new blank page opens up, and when we refresh page it comes back to the home page.
