Apex example 3: Sending Scrive document from Scrive template with addition of signing party

• scrive.ScriveDocument doc = scrive.ScriveDocument.createFromTemplate('Template Id from Scrive');   
• Contact[] contacts = [SELECT Id, AccountId 
•             FROM Contact 
•             WHERE Id = '00358000007mZL2']; 
• doc.addParty(contacts.get(0)); 
• doc.fillin();   
• scrive.ScriveDeliveryService.send(doc);  

 Note that only Contact and User are currently accepted as source of Party.