I am able to login to JIRA by email address using token authentication
I have attached an image under description of an issue that I created in my JIRA
While getting the output I am unable to get the image url and Activity information such as comment, worklogs etc of that issue.Please find the attachment in which I have shown the code to get the data from JIRA using c#.

Hello @ganesh.m,
Since you’re using Search for issues using JQL (POST), try adding the fields comment, worklog, etc. in your request body. The avatarUrl is also returned. Here’s the request body I used where you can pattern your C# code from.
{
"jql": "project = ES",
"startAt": 0,
"maxResults": 15,
"fields": [
"summary",
"comment",
"worklog"
],
"fieldsByKeys": false
}
Cheers,
Ian
I have used the below url to get information of particular issue
“https://plural.atlassian.net/rest/api/latest/issue/” + issueId + “/”
In that info I am able to get attachments urls included in that issue
I have used below code to download that attachments to my local path.
webClient.DownloadFile(imageurl, localpath);
Able to download but the file getting corrupted
Please help me on this or else suggest me the way to download the image to my local path