How to retrieve Forum/discussion attachments of a course in Moodle LMS? - moodle

Question

I have to list all the attachments of a discussion in a course. I don't know how to retrieve all the attachments URLs in a forum/discussion in Moodle LMS.
My code is in c# and usually, I call the Moodle REST API as http://localhost:8077/webservice/rest/server.php?wstoken=11e2d8b7f8e21ca1804e41e9cac5a812&wsfunction=core_course_get_contents&courseid=4&moodlewsrestformat=json and I can get the fileurl for the course files.
Likewise, I would like to retrieve forum/discussion files but I don't see any fileurl or something similar.
I only see the response as below:
[
{
"id": 22,
"name": "General",
"visible": 1,
"summary": "",
"summaryformat": 1,
"section": 0,
"hiddenbynumsections": 0,
"uservisible": true,
"modules": []
},
{
"id": 23,
"name": "Introduction",
"visible": 1,
"summary": "",
"summaryformat": 1,
"section": 1,
"hiddenbynumsections": 0,
"uservisible": true,
"modules": [
{
"id": 46,
"url": "http://localhost:8077/mod/resource/view.php?id=46",
"name": "Everest (.txt)",
"instance": 24,
"contextid": 102,
"visible": 1,
"uservisible": true,
"visibleoncoursepage": 1,
"modicon": "http://localhost:8077/theme/image.php/boost/core/1613571924/f/text-24",
"modname": "resource",
"modplural": "Files",
"indent": 0,
"onclick": "",
"afterlink": null,
"customdata": "\"a:1:{s:10:\\\"printintro\\\";i:1;}\"",
"noviewlink": false,
"completion": 1,
"completiondata": {
"state": 0,
"timecompleted": 0,
"overrideby": null,
"valueused": false
},
"contents": [
{
"type": "file",
"filename": "Everest.txt",
"filepath": "/",
"filesize": 935,
"fileurl": "http://localhost:8077/webservice/pluginfile.php/102/mod_resource/content/1/Everest.txt?forcedownload=1",
"timecreated": 1621949734,
"timemodified": 1621949744,
"sortorder": 1,
"mimetype": "text/plain",
"isexternalfile": false,
"userid": 2,
"author": "DP Bhatt",
"license": "unknown"
}
],
"contentsinfo": {
"filescount": 1,
"filessize": 935,
"lastmodified": 1621949744,
"mimetypes": [
"text/plain"
],
"repositorytype": ""
}
},
{
"id": 47,
"url": "http://localhost:8077/mod/forum/view.php?id=47",
"name": "Forum",
"instance": 5,
"contextid": 112,
"visible": 1,
"uservisible": true,
"visibleoncoursepage": 1,
"modicon": "http://localhost:8077/theme/image.php/boost/forum/1613571924/icon",
"modname": "forum",
"modplural": "Forums",
"indent": 0,
"onclick": "",
"afterlink": null,
"customdata": "\"\"",
"noviewlink": false,
"completion": 1,
"completiondata": {
"state": 0,
"timecompleted": 0,
"overrideby": null,
"valueused": false
}
}
]
}
]
It would be great if someone guides me on the right path. Thank you very much in advance.