title: Can not pay in paypal sandbox using a test Test Account
body: <p>Since paypal updated their sandbox, I encounter a lot of problems. I can not simulate a payment using sandbox. Whenever i use an "old test account", created before the update, this error message comes out</p>
  
  <blockquote>
    <p><strong>This Sandbox email address is not available. Please enter another email address.</strong></p>
  </blockquote>
  
  <p>I have created a new account and unfortunately it also doesn't work. Same error message comes out.  Below is the details that inputted to create an account.</p>
  
  <ol>
  <li>email: "test@test.com"</li>
  <li>payment bal. : 5000</li>
  <li>bank verified: yes</li>
  <li>paymentcard: paypal</li>
  <li>credit card type: none</li>
  </ol>
  
  <p><strong>Can anyone tell how to do payment simulation using the  new  paypal sandbox?</strong> I have read all the documenation in x.com, None of them worked. The links redirects me to developers.paypal.com and prompt me to login again and again. </p>