InjectedField

Hi all, I am just getting through a few cycles of testing in the sand box on my way to uploading and populating large form with multiple signers from an external web app. It seems the documentation is not all the clear how to map fields to existing to PDF form fields. Also is there a way to test my code (100 plus fields and values) with out having to actually submit a package and wait for the emails to be sent? It sends the document with out any errors but there are no fields filled in and no signature fields added.