get representation from part

Hi so I'm working on this Thing that takes information from windchill, and puts it though a calculator to return times for the part. but is there anyway to use an O data connector or any feature to get a representation from windchill, there is the WRS partGetRepresentation but I do not know how to implement that into a service that can be called with a part Id or number, I currently am using getJSON to get the urls but that needs credentials in the code but is there a way to avoid having to log in each time by doing it another method that doesnt need to login.

var url = "XXXXXXXXXXXXXXXXXX/Windchill/servlet/odata/v7/ProdMgmt/Parts('" + input + "')/Representations";

var result;

try {
 var response = Resources["ContentLoaderFunctions"].GetJSON({
 		url: url,
 username: user,
 password: pass,
 timeout: 10 
 });

 if (response.value && response.value.length > 0) {
 var rep = response.value[0];

 // Check for valid 2D/3D thumbnail URLs
 if (rep.TwoDThumbnailURL && rep.TwoDThumbnailURL.URL) {
 var imageURL = rep.TwoDThumbnailURL.URL;
 logger.warn("2D image URL: " + imageURL);

 try {
 var imageResponse = Resources["ContentLoaderFunctions"].LoadImage({
 url: imageURL,
 username: user,
 password: pass
 });
 result = imageResponse;
 } catch (imgErr) {
 logger.error("Image load failed: " + imgErr.message);
 result = null;
 }
 } else {
 logger.warn("No valid thumbnail URL found.");
 result = null;
 }
 } else {
 logger.warn("No representations found.");
 result = null;
 }
} catch (err) {
 logger.error("Windchill fetch failed: " + err.message);
 result = null;
}