Issue session token is not working salesforce rest api call

Sendbird Chat API/SDK JavaScript
1

Issuing session token is not working in salesforce rest api call. below request is returning with

{
    "error": true,
    "message": "Invalid value: \"JSON body.\".",
    "code": 400403
}

 HttpRequest req = new HttpRequest();
        HttpResponse res = new HttpResponse();
        Http http = new Http();
        string endpointUrl = 'https://api-FF2FEEA8-005C-4BAE-A25D-C578DE8B54D3.sendbird.com/v3/users/e90b91bb-d946-43d2-afec-325ea6ffc669/token';
        req.setEndpoint(endpointUrl);
        req.setMethod('POST');
        req.setHeader('Content-Type', 'application/json; charset=UTF-8');  
        req.setBody('{"user_id":"e90b91bb-d946-43d2-afec-325ea6ffc669"}');        
        try {
            res = http.send(req);
            if (res.getStatusCode() == 200) {
                System.debug('Success!');
                
            } else {
                System.debug('HTTP error: ' + res.getStatusCode());
            }
            System.debug(res.getBody());
        } catch(System.CalloutException e) {
            System.debug('Callout error: '+ e);
        }
2

Hello @saikrishna,

Welcome to the Sendbird Community.

It looks like you’re passing an invalid JSON body to the request. The body does not take in a key value pair of user_id but rather a key value pair of expires_at with a unix timestamp. Alternatively, you can send an empty JSON body and use the default expiration date of 7 days.