Support to search with different type (#66)

Possible types :  ISBN, UPC, EAN, or ReferenceID
Default : ReferenceID

Author: devmegh

src/findingApi.js

@@ -73,10 +73,11 @@ const getVersion = function () {
 const findItemsByProduct = function (options) {
     if (!options) throw new Error('INVALID_REQUEST_PARMS --> Please enter the Valid input.');
     if (!options.productId) throw new Error('INVALID_REQUEST_PARMS --> Product ID is required.');
+    let type = options.type ? options.type : 'ReferenceID';
     this.options.operationName = 'findItemsByProduct';
     this.options.additionalParam = constructAdditionalParams(options);
     let url = urlObject.buildSearchUrl(this.options);
-    url = `${url}&productId.@type=ReferenceID`;
+    url = `${url}&productId.@type=${type}`;
     return getRequest(url).then((data) => {
         return JSON.parse(data).findItemsByProductResponse;