For integrated signing (e.g. iFrame in your portal application - signer is authenticated in your application):
A feature introduced in version 10.6 of the SDK allows you to create a Session Token for a Signer using the Signers Email address, instead of having to use their Signer ID.
This makes it much easier to request Session Tokens, as you don't need to track the Signer Id in order to make the request - simply use their Email address.
For example, you might not want to generate custom Signer Id's and manage them in your integration layer.