To integrate your offers workflow with DocuSign, make sure to set up a DocuSign subscription. A DocuSign subscription on any edition will work!
We recommend at least the Business edition because it comes with unlimited documents.
Note that DocuSign sometimes refers to documents as "envelopes". Trial DocuSign accounts come with a very limited number of "envelopes," so use them wisely!
A candidate won't need a DocuSign account to sign their offer letter.