问题
In the past, it was possible to specify which Express Checkout flow (login or guest) a user would experience by passing the LANDINGPAGE parameter (along with SOLUTIONTYPE set to "Sole") as part of the SetExpressCheckout request. If set to "Billing", the checkout experience would default to guest checkout, whereas if set to "Login", the user would be asked to authenticate with their PayPal account.
PayPal appears to be experimenting with a new Express Checkout UI, which does not honor the LANDINGPAGE parameter; even if Billing is passed, the login flow is dispatched in the interface.
Is there a way to force display guest checkout in the new Express Checkout UI on redirect?
回答1:
We're fixing that as we speak. LANDINGPAGE will continue to work for you after this.
来源：https://stackoverflow.com/questions/20226209/paypal-expresscheckout-landingpage-parameter-deprecated