<div dir="ltr">That is true, but we are integrating with certain SPs, such as Office 365, for multiple customers. We need to know, as part of our workflow, on behalf of which customer the authorisation is requested. Identifying by entity id won't work because of the one-to-many relationship between the SP and the customers on behalf of which we integrate with that SP.</div><div class="gmail_extra"><br><div class="gmail_quote">On 8 January 2016 at 12:51, Tom Scavo <span dir="ltr"><<a href="mailto:trscavo@internet2.edu" target="_blank">trscavo@internet2.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Fri, Jan 8, 2016 at 4:43 AM, Bogdan Albei <<a href="mailto:bogdan.albei@callsign.com">bogdan.albei@callsign.com</a>> wrote:<br>
><br>
> We are an IdP that integrates with various SPs on behalf of our customers.<br>
> Let's say we have customer A and customer B that both want us to act as an<br>
> IdP and provide authentication for Office 365. The problem is when we<br>
> receive a SAML request from Office 365(the SP). At that point we need to<br>
> know if that request is made on behalf of customer A or customer B. How<br>
> could the SP send that extra information?<br>
<br>
</span>The SAML AuthnRequest contains the globally unique entityID of the SP<br>
making the request (or more accurately, the SP wishing a response). So<br>
no "extra information" is needed.<br>
<span class="HOEnZb"><font color="#888888"><br>
Tom<br>
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</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="color:rgb(136,136,136)">Bogdan Albei</span><div style="color:rgb(136,136,136)">Senior Platform Engineer</div><div style="color:rgb(136,136,136)">Callsign Inc.</div><div style="color:rgb(136,136,136)">[C] bogdan</div><div><br></div></div></div></div></div></div></div></div></div></div></div>
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