Hi all, I have been trying to make an API call to Vend's API. Essentially, I have done step 1, and am stuck at step 2. Firstly, https://developers.vendhq.com/documentation/intro.html The Vend API currently only supports JSON encoded data as requests and responses. Be sure to set both the Content-Type and Accept headers to application/json to identify the request and response format. Secondly, for this call, I am told the following - https://developers.vendhq.com/documentation/oauth.html NOTE: Those parameters should be sent as “application/x-www-form-urlencoded” encoded body of aPOST request. They should not be sent as GET parameters in a query string. <!DOCTYPE html> <html> <head> <title>API</title> <script src="//code.jquery.com/jquery-1.11.3.min.js"></script> <script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script> </head> <body> <script> $(document).ready(function() { $.ajax({ type: 'POST', url: 'https://firststore.vendhq.com/api/1.0/token', dataType: 'json', accepts: 'application/json', // accepts json response beforeSend: function(req) { req.setRequestHeader("Access-Control-Allow-Origin", "*"); }, crossDomain: true, contentType: "application/x-www-form-urlencoded", // send as x-www-form-urlencoded data: "code=abc&client_id=abc&client_secret=abc&grant_type=authorization_code&redirect_uri=http://testtesttest.com, success: function(success) { console.log('hello!'); }, error: function(e) { //called when there is an error console.log('error'); }, }); }); </script> </body> </html> Code (markup): The error that was throw back in the browser console is this - XMLHttpRequest cannot load https://firststore.vendhq.com/api/1.0/token. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://testtesttest.com' is therefore not allowed access. The response had HTTP status code 401. Can someone advice as to if I am doing it wrongly, and if so, how should I approach this API call? Thank you!