title: How do I get an application id for the Paypal sandbox?
body: <p>I've been going around in circles with the paypal documentation. How do I get a paypal app id for the paypal sandbox using the Adaptive Payment API? I already have a username/password/signature for the sandbox.</p>
  
  <p><strong>Adaptive Payments has been deprecated. Please see the comment from Lenny Markus (current Director of Engineering at PayPal) on the answer below.</strong></p>