I am trying to use

https.requestRestlet

but it gives me an html response with code 500, and message

An unexpected error has occurred. Please click here to notify support and provide your contact information.

I hate it when NS doesn't give a meaningful response message. Did anyone tried this method before? Here is my code:

var headers = {
   Accept: "application/json",
};
var res = https.requestRestlet({
   body: payload,
   method: "POST",
   headers: headers,
   deploymentId: "customdeploy_edc_invoices_sync",
   scriptId: 230,
});

use the Content-Type header instead of the Accept header

Will try it...