[Question] Can I verify the user input email and SAML response email in ACS? #372

Hi, I am looking to implement SSO login using djangosaml2.

The login process is as follows:

1. The user first inputs their email on our website, and then calls the SP server API.
2. The SP server API then instructs the browser to redirect to the IdP.
3. The user logs in on the IdP.
4. The IdP POSTs ACS with email attributes in the SAML response.
5. In the ACS, I have implemented a class called ModifiedSaml2Backend which inherits from Saml2Backend.
6. Login is successful.

I need to verify whether the email that the user inputted (in step 1) is the same as the email in the SAML response (in step 4).
Is it possible to include the email in the SAML request (in step 2) and retrieve it in the ACS (in step 5)?