Pull Transaction ID for each signed document

Hi ,

I am using EchoSignDocumentService21 for creating personalise widget and present it to user to get it signed.

I use same service to pull the signed PDF's to our system.

What I need ?

When a document is signed by user Adobe Sign Document History is generated listing details like when it was created, when it was signed and when emailed.

This Audit also include one value which Transaction ID,

I need to pull this ID somehow to our system. Can some one help me how to pull this .