def agreement_documents(agreement_id, recipient_email, format, version_id=nil)
     result = Echochamber::Request.agreement_documents(token, agreement_id, recipient_email, format, version_id)
   end
def agreement_documents(agreement_id, recipient_email, format, version_id=nil)
     result = Echochamber::Request.agreement_documents(token, agreement_id, recipient_email, format, version_id)
   end
All documents relating to an agreement

 @param agreement_id [String] (REQUIRED)
 @param recipient_email [String] The email address of the participant to be used to retrieve documents. (REQUIRED)
 @param format [String] Content format of the supported documents. It can have two possible values ORIGINAL or CONVERTED_PDF. (REQUIRED)
 @param version_id [String] Version of the agreement as provided by agreement_info().  If not provided, the latest version of the agreement is used.
 @return [Array] Documents relating to agreement.