DocuSign REST API - RecipientView异常"UNKNOWN_ENVELOPE_RECIPIENT"

我们目前在使用docusign开发集成Web解决方案时遇到一些技术难题.您能否就以下事项提出建议:

1)我们如何在基于文档的rest api调用上为收件人分配签名顺序？我们可以有一个json示例吗？

2)我们目前无法为已添加到已创建信封的用户检索签名网址.此代码以前用于基于模板的信封创建,但不适用于基于使用PDF的代码.

对docusign API的调用和响应(删除了密码)如下所示.已经尝试了两种失败的认证方法.通过信封中找到的任一电子邮件进行检索也会失败.

POST \\https://demo.docusign.net/restapi/v2/accounts/426142/envelopes/3b2d7418-27d3-4a80-8969-d875b6fb9548/views/recipient HTTP/1.1 
X-DocuSign-Authentication: {"Username":"18f90756-70b1-4f5f-b360-48b198a17215","Password":"*REMOVED*","IntegratorKey":"*REMOVED*"} 
Accept: application/json, application/xml, text/json, text/x-json, text/javascript, text/xml  
Content-Type: application/json 
Host: demo.docusign.net 
Content-Length: 128 
Accept-Encoding: gzip, deflate 

{
    "authenticationMethod": "email",
    "userName": "Simon",
    "email": "test@email",
    "returnUrl": "http://www.google.com"
} 

HTTP/1.1 400 Bad Request 
Cache-Control: no-cache 
Content-Length: 274 
Content-Type: application/json; charset=utf-8 
Date: Fri, 24 Jan 2014 12:11:38 GMT 
Strict-Transport-Security: max-age=7776000; includeSubDomains 

{ 
"errorCode": "UNKNOWN_ENVELOPE_RECIPIENT", 
"message": "The recipient you have identified is not a valid recipient of the specified envelope. Envelope recipient could not be determined. 'clientUserId', 'email', or 'userName' in request and envelope may not match." 
} 

非常感谢