Can I get information about completed envelopes and documents through the API?
Yes, reports can be retrieved using our DocumentNOW V3 (REST) and SOAP API methods.
For REST below are methods for information propose
/envelopes
/envelopes/{envelopeID}
/envelopes/{envelopeID}/history
/envelopes/{envelopeID}/status
And for V2 SOAP, here are methods use to retrieve information
CheckStatus
CheckEnvelopeStatus
ViewHistory