It seems not have API to update private message https://docs.discourse.org/#operation/createTopicPostPM I want to update a private message Could I use PUT topic to do it? Do you have any idea to update private message?

See How to reverse engineer the Discourse API . You’re on the right track, I think.

It seems blank here: https://meta.discourse.org/t/how-to-reverse-engineer-the-discourse-api/20576/32

كيفية تحديث رسالة خاصة عبر API؟

pfaffman (Jay Pfaffman) 9 يناير 2022، 11:25ص 2

الموضوع		الردود	مرات العرض
Private Message Send API Support	21	5513	26 أبريل 2021
Replying to PM via API not working anymore Support	4	1001	20 أبريل 2020
There are 2 IDs when I try to get API, in case of lack documentation Development rest-api	2	851	14 يناير 2022
Private message with attachment/upload via API Support rest-api	2	93	1 أكتوبر 2025
Move topic / posts to Private Conversation Support	5	2344	31 ديسمبر 2018