It seems not have API to update private message Discourse API Docs 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	5609	26 أبريل 2021
Replying to PM via API not working anymore Support	3	1030	21 مارس 2020
There are 2 IDs when I try to get API, in case of lack documentation Development rest-api	1	883	14 يناير 2022
Private message with attachment/upload via API Support rest-api	2	138	1 أكتوبر 2025
Move topic / posts to Private Conversation Support	4	2374	31 ديسمبر 2018