Remote API does not work.
So in trying to export all the surveys I run this code.

define( 'LS_BASEURL', 'http://192.168.10.37/surveysoft/'); // adjust
this one to your actual LimeSurvey URL
define( 'LS_USER', 'XXX' );
define( 'LS_PASSWORD', 'XXX' );
$survey_id = 76352;
$myJSONRPCClient = new jsonRPCClient(
LS_BASEURL.'index.php/admin/remotecontrol' );
$sessionKey= $myJSONRPCClient->get_session_key( LS_USER, LS_PASSWORD );
$data = $myJSONRPCClient->export_responses($sessionKey,$survey_id,'csv');

var_dump($data);

and it tells me

PHP Fatal error: Uncaught exception 'Exception' with message
'Incorrect response id (request id: 1, response id: )' in
/var/www/jsonRPCClient.php:152
Stack trace:
#0 /var/www/test.php(10): jsonRPCClient->__call('export_response...', Array)
#1 /var/www/test.php(10):
jsonRPCClient->export_responses('ejrp28vju8ueexx...', 76352, 'pdf')
#2 {main}
thrown in /var/www/jsonRPCClient.php on line 152