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function put(context) {
            doValidation([context.recordtype, context.id], ['recordtype', 'id'], 'PUT');
            var rec = record.load({
                type: context.recordtype,
                id: context.id
            });
            for (var fldName in context)
                if (context.hasOwnProperty(fldName))
                    if (fldName !== 'recordtype' &amp;&amp; fldName !== 'id')
                        rec.setValue(fldName, context[fldName]);
           var result= rec.save();
            return String(result);

it always returns 200 but never update the record

Make some logs, log context and type of context and see what is in there, you may need  to parse the request body as object or something…

I don't think that code should work, even though it looks like the example NS provides in help

the code above expects the request payload to be properties on `context` which hopefully isn't how it works

try referencing `context.requestBody` instead. I'm also kinda sad NS put this relatively complicated and broad (can set any field) code as their example