title: Does django-saml2-auth support share tokens between service providers (SPs)?
body: <p>First of all, SAML noob here.</p>
  
  <p>Does django-saml2-auth support tokens being shared between Service Providers (SPs)? Eg. Service provider A can perform an <strong>API</strong> request with a SAML token (issued by same IdP) to Service provider B, so the request is authenticated automatically (without needing to redirect the browser to IdP)?</p>
  
  <p>Some code is better than no code, but I am not familiar with the plugin so I am just gonna make up some imaginary settings that specified in both service providers:</p>
  
  <pre><code>MUTUAL_AGREED_IdP = 'http://idp.example.com'
  </code></pre>
  
  <p>By the way, is this called 'federation'? I read the wiki about SAML federation, it mentions about 2 different IdPs to form a federation, but in my example is just one IdP.</p>