如何使用Rest Recipes在Docusign中使用Next和previous Uri

我想使用Rest Recipes获取20条记录/请求信封信息。

我的要求是:

当20条记录被转储到数据库时，我想要击中另一批，它将从21到40获取我的记录，然后在第三次调用中从41到60，等等…

我已经使用了下面的代码，但没有得到任何想法，如何获得信息，如分页。//调用Login() API设置用户的baseUrl并返回他们的accountId

string accountId = loginApi(USER_NAME, PASSWORD);
// Set the Start Date (to limit the results returned)
DateTime fromDate = new DateTime(2016, 09, 15);
string fromDateStr = fromDate.ToString("o");
DateTime toDate = new DateTime(2016, 09, 16);                
string toDateStr = toDate.ToString("o");
// set a filter for the envelopes we want returned using the 
// fromDate and count properties
// Here I want to use paging like functionality.
EnvelopesApi.ListStatusChangesOptions options = new EnvelopesApi.ListStatusChangesOptions()
{
    count = "20",// How to increase this counter for next request?
    fromDate = fromDateStr,
    toDate = toDateStr
};
EnvelopesApi envelopesApi = new EnvelopesApi();
EnvelopesInformation envelopes = envelopesApi.ListStatusChanges(accountId, options);