How can an SP send extra information to the IdP

[Bogdan Albei]

Hi all,
We are an IdP that integrates with various SPs on behalf of our customers.
Let's say we have customer A and customer B that both want us to act as an
IdP and provide authentication for Office 365. The problem is when we
receive a SAML request from Office 365(the SP). At that point we need to
know if that request is made on behalf of customer A or customer B. How
could the SP send that extra information? I tried to send that as part of
the POST or Redirect URL, but Shibboleth complains about it.
Any suggestion would be appreciated.

Cheers,
Bogdan
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