I am trying to develop a scenario on Integromat.com to call the API ("RemoteControl") of LimeSurvey to dynamically add participants to a survey.

I tested the call to the "get_session_key" function.

URL: survey.mydomain.com/index.php/admin/remotecontrol

HTTP method: POST

Header:
Content-Type: application/json
Accept: application/json
Accept-Charset: utf-8

Body:
{"method": "get_session_key", "params": {"username": "my_user_name", "password": "my_password","plugin":"Authdb"}}

Username and password are correct. I always get a "null" response.

Can someone tell me where I am wrong?

This is the answer I receive when I try with Advanced Rest Client (Chrome extension) :

{"id":null,"result":null,"error":"unable to decode malformed json"}

I think there are a HTML error here maybe have a look to server log ?
(we must imporove error log with remote_control, really difficult).

Hi !
I had a look at log files. Nothing found. And http response is "200".

Silly question surely : remote control is activated ?

Yes...Remotecontrol is enabled.

Activated RPC Interface : JSON-RPC
Publish API in /admin/remotecontrol : YES
Devine Access-Control_allow_origin header : NO
(no difference if yes, obviously)

Are there some specific php modules that should be activated too ? Something else I have to think about ?