DocuSign and Force.com custom integration

Recently I run into requirement to develop custom integration electronic signature SaaS solution within Salesforce platform (Force.com). This was due to problems with installation of DocuSign package from AppExchange. This article describes main concepts to do that. SFDC design: On the Salesforce side – I will use a custom object called Document that will represent any DocuSignable object (contract / offer / purchase order) in the environment. Document object will have special fields to…