Exporting the digital certificate

The building department is asking for a digitally signed drawing that they can also add comments, fill in forms, and be signed by them. AdobeSign does not allow any of these preferences once digitally signed. We do use another service that does allow this but we don't have the third party authorization certificate with that company. My question is, is there a way to export the third party digital certificate from AdobeSign to store on a local computer since we are paying for this service?