Hi @Harvey Mercado,
What Destination URL are you referring to? Are you referring to the SAML Assertion? If so, Crowdstack doesn't use Destination URL.
Note that the Assertion Consumer Service URL is defined in your Crowdstack SAML metadata, which is found at the /saml/metadata path in Crowdstack. I don't know which Crowdstack you're affiliated with or I would provide the direct URL to you.
Crowdstack doesn't put any requirements on the Issuer or Audience. You will need to make sure the Request ID is properly returned per the SAML Assertion standard.
The only other real requirement is to use the HTTP POST binding, as reflected in Crowdstack's SAML metadata. You can pass Email Address and Display Name as attributes in the Assertion, as well as other profile fields. You'll have the ability to configure these once you have your IdP set up and load your metadata XML into the Crowdstack control panel.
I would recommend you don't worry too much about those specifics and get to where you have a functional IdP that implements SAML standards, get your metadata uploaded to Crowdstack, and then take a look at the configuration from there.
If you have any questions or issues during integration, just let us know if we can assist.
Regards,
Brian