I`m new to SAML/SSO configuration and I was wondering if someone can point me in right direction. I have a requirement where I need to configure a third party app as a service provider (Salesforce to act as IdP). I have already shared my org certificate with this Third Party App engineers and in return, they have shared their ACS and entity URL with me. However, SSO is not working.
Is 'Connected App' the only way to establish SSO in Salesforce?
In a documentation shared by this Third Party app, they have given a standard SAML/XML response. Could we create a custom functionality (without using Connected App) to establish SSO?