Which element is required for adding a Log In with PayPal button to a website?

The Instant Payment Notification (IPN) Simulator sends mock notifications to a notification handler.

Utilizing the Sandbox test site allows the developer to:

Which of these are NOT steps in the PayPal payment flow?

Is it possible to transfer payment from one Paypal user's account to another user's Paypal account ?

Which of these are NOT steps in the auth flow?

If you want to handle credit card details on your own server, which object do you need to directly pass details to PayPal?

Which of these provide the URI of the server that handles your request?

What is the access token provided by PayPal also called?

Will Seamless Checkout work with OpenID?

Which of the following languages does not have an SDK for REST APIs?