diff --git a/README.md b/README.md
index bc85c31..93ee4be 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,7 @@ let eBay = require('ebay-node-api')
 let ebay = new eBay({
     clientID: "-- Client APP ID ----",
     // options  - optional HTTP request timeout to apply to all requests.
+    env: "SANDBOX" // optional default = "PRODUCTION"
 })
 ```
 Creates a new `Ebay` instance.
@@ -59,11 +60,14 @@ Creates a new `Ebay` instance.
 Join eBay developers program.
 Register your app here https://go.developer.ebay.com/quick-start-guide.
 
+If you using Sandbox environment, make sure to provide `env` variable in options as mentioned above.
+
 #### Options
 
 - `clientID` - Required(`String`) - Client Id key provided when you register in eBay developers program.
 - `limit` - optional(`Number`) - fetch items functionality - Number that limits the number of data you need in response.
 - `details` - optional(`Boolean`) - Get User Details functionality - true, if you need details about the user.
+- `env` - optional(`String`) - Environment, default value is PRODUCTION.
 
 ## Example
 
diff --git a/package.json b/package.json
index baef2df..2c18d87 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ebay-node-api",
-  "version": "2.3.1",
+  "version": "2.5.1",
   "description": "Ebay node api client",
   "main": "./src/index.js",
   "homepage": "https://github.com/ajay2507/ebay-node-api",
@@ -29,4 +29,4 @@
     "nock": "^9.2.3",
     "sinon": "^4.4.5"
   }
-}
+}
\ No newline at end of file
diff --git a/src/buildURL.js b/src/buildURL.js
index 05e0647..6b506b7 100644
--- a/src/buildURL.js
+++ b/src/buildURL.js
@@ -13,7 +13,8 @@ const buildURL = {
    * @private
    */
     buildSearchUrl(options) {
-        let base_url = "http://svcs.ebay.com/services/search/FindingService/v1?";
+        console.log(options);
+        let base_url = `http://${options.baseSvcUrl}/services/search/FindingService/v1?`;
         base_url += "SECURITY-APPNAME=" + options.clientID;
         base_url += "&OPERATION-NAME=" + options.operationName;
         base_url += "&SERVICE-VERSION=1.0.0&RESPONSE-DATA-FORMAT=JSON";
@@ -33,7 +34,7 @@ const buildURL = {
    * @private
    */
     buildShoppingUrl(options) {
-        let base_url = "http://open.api.ebay.com/Shopping?";
+        let base_url = `http://${options.baseUrl}/Shopping?`;
         base_url += "appid=" + options.clientID;
         base_url += "&callname=" + options.operationName;
         base_url += "&version=967&siteid=0&responseencoding=JSON&";
diff --git a/src/buy-api.js b/src/buy-api.js
index 4656894..99abc2c 100644
--- a/src/buy-api.js
+++ b/src/buy-api.js
@@ -7,7 +7,7 @@ const getItem = function (itemId) {
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
     const id = encodeURIComponent(itemId);
-    return makeRequest('api.ebay.com', `/buy/browse/v1/item/${id}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/buy/browse/v1/item/${id}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
@@ -20,7 +20,7 @@ const getItemByLegacyId = function (legacyOptions) {
     let param = "legacy_item_id=" + legacyOptions.legacyItemId;
     param += legacyOptions.legacyVariationSku ? "&legacy_variation_sku=" + legacyOptions.legacyVariationSku : '';
 
-    makeRequest('api.ebay.com', `/buy/browse/v1/item/get_item_by_legacy_id?${param}`, 'GET', this.options.body, auth).then((result) => {
+    makeRequest(this.options.baseUrl, `/buy/browse/v1/item/get_item_by_legacy_id?${param}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     }).then((error) => {
         console.log(error.errors);
@@ -34,7 +34,7 @@ const getItemByItemGroup = function (itemGroupId) {
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
     return new Promise((resolve, reject) => {
-        makeRequest('api.ebay.com', `/buy/browse/v1/item/get_items_by_item_group?item_group_id=${itemGroupId}`, 'GET', this.options.body, auth).then((result) => {
+        makeRequest(this.options.baseUrl, `/buy/browse/v1/item/get_items_by_item_group?item_group_id=${itemGroupId}`, 'GET', this.options.body, auth).then((result) => {
             resolve(result);
         }).then((error) => {
             reject(error);
@@ -55,7 +55,7 @@ const searchItems = function (searchConfig) {
     if (searchConfig.fieldgroups != undefined) queryParam = queryParam + "&fieldgroups=" + searchConfig.fieldgroups;
     if (searchConfig.filter != undefined) queryParam = queryParam + "&filter=" + encodeURIComponent(makeString(searchConfig.filter, { quotes: "no", braces: 'false' }));
     return new Promise((resolve, reject) => {
-        makeRequest('api.ebay.com', `/buy/browse/v1/item_summary/search?${queryParam}`, 'GET', this.options.body, auth).then((result) => {
+        makeRequest(this.options.baseUrl, `/buy/browse/v1/item_summary/search?${queryParam}`, 'GET', this.options.body, auth).then((result) => {
             resolve(result);
         }).then((error) => {
             reject(error);
diff --git a/src/constants.js b/src/constants.js
index c434f75..1c87a4e 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -1,6 +1,9 @@
 'use strict';
 
 module.exports = {
+    PROD_BASE_URL: "api.ebay.com",
+    SANDBOX_BASE_URL: "api.sandbox.ebay.com",
     BASE_SVC_URL: "svcs.ebay.com",
+    BASE_SANDBX_SVC_URL: "svcs.sandbox.ebay.com",
     MERCH_SRVC_NAME: "MerchandisingService"
 }
\ No newline at end of file
diff --git a/src/index.js b/src/index.js
index 4b6a8b5..e24f761 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,13 +10,23 @@ const { getDefaultCategoryTreeId,
     getCategorySuggestions,
     getItemAspectsForCategory } = require('./taxonomy-api');
 const { getSimilarItems, getMostWatchedItems } = require('./merchandising');
+const { PROD_BASE_URL, SANDBOX_BASE_URL, BASE_SANDBX_SVC_URL, BASE_SVC_URL } = require('./constants');
 const urlObject = require('./buildURL');
-
+const PROD_ENV = "PROD";
+const SANDBOX_ENV = "SANDBOX";
 function Ebay(options) {
 
     if (!options) throw new Error("Options is missing, please provide the input");
     if (!options.clientID) throw Error("Client ID is Missing\ncheck documentation to get Client ID http://developer.ebay.com/DevZone/account/");
     if (!(this instanceof Ebay)) return new Ebay(options);
+    if (!options.env) options.env = PROD_ENV;
+    options.baseUrl = PROD_BASE_URL;
+    options.baseSvcUrl = BASE_SVC_URL;
+    // handle sandbox env.
+    if (options.env === SANDBOX_ENV) {
+        options.baseUrl = SANDBOX_BASE_URL;
+        options.baseSvcUrl = BASE_SANDBX_SVC_URL;
+    }
     this.options = options;
     this.options.globalID = options.countryCode || "EBAY-US";
 }
@@ -64,6 +74,7 @@ Ebay.prototype = {
     getVersion: function () {
         this.options.operationName = "getVersion";
         const url = urlObject.buildSearchUrl(this.options);
+        console.log(url);
         return getRequest(url).then((data) => {
             return JSON.parse(data)["getVersionResponse"][0];
         }, console.error
@@ -94,7 +105,7 @@ Ebay.prototype = {
         const encodedStr = base64Encode(this.options.clientID + ":" + this.options.clientSecret);
         const self = this;
         const auth = "Basic " + encodedStr;
-        return makeRequest('api.ebay.com', '/identity/v1/oauth2/token', 'POST', this.options.body, auth).then((result) => {
+        return makeRequest(this.options.baseUrl, '/identity/v1/oauth2/token', 'POST', this.options.body, auth).then((result) => {
             const resultJSON = JSON.parse(result);
             self.setAccessToken(resultJSON.access_token);
             return resultJSON;
diff --git a/src/merchandising.js b/src/merchandising.js
index 1a1c4c4..f0dc666 100644
--- a/src/merchandising.js
+++ b/src/merchandising.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const { getRequest } = require('./request');
-const { BASE_SVC_URL, MERCH_SRVC_NAME } = require('./constants');
+const { MERCH_SRVC_NAME } = require('./constants');
 
 //https://developer.ebay.com/devzone/merchandising/docs/CallRef/getMostWatchedItems.html#Samples
 
@@ -11,12 +11,11 @@ const { BASE_SVC_URL, MERCH_SRVC_NAME } = require('./constants');
   * @param {String} categoryId (optional)
   */
 const getMostWatchedItems = function (merchOptions) {
-    console.log(this);
     if (!this.options.clientID) throw new Error("Missing App id or client id");
     let url = '';
     if (merchOptions && merchOptions.categoryId != undefined) url = `&categoryId=${merchOptions.categoryId}`;
     if (merchOptions && merchOptions.maxResults) url = `&maxResults=${merchOptions.maxResults}`;
-    return getRequest(`http://${BASE_SVC_URL}/${MERCH_SRVC_NAME}?OPERATION-NAME=getMostWatchedItems&SERVICE-NAME=${MERCH_SRVC_NAME}&SERVICE-VERSION=1.1.0&CONSUMER-ID=${this.options.clientID}&RESPONSE-DATA-FORMAT=JSON&REST-PAYLOAD${url}`).then((result) => {
+    return getRequest(`http://${this.options.baseSvcUrl}/${MERCH_SRVC_NAME}?OPERATION-NAME=getMostWatchedItems&SERVICE-NAME=${MERCH_SRVC_NAME}&SERVICE-VERSION=1.1.0&CONSUMER-ID=${this.options.clientID}&RESPONSE-DATA-FORMAT=JSON&REST-PAYLOAD${url}`).then((result) => {
         return JSON.parse(result);
     }).catch((error) => {
         console.log(error);
@@ -34,7 +33,7 @@ const getSimilarItems = function (merchOptions) {
     let url = '';
     if (merchOptions && merchOptions.itemId) url = `&itemId=${merchOptions.itemId}`;
     if (merchOptions && merchOptions.maxResults) url = `${url}&maxResults=${merchOptions.maxResults}`;
-    return getRequest(`http://${BASE_SVC_URL}/${MERCH_SRVC_NAME}?OPERATION-NAME=getSimilarItems&SERVICE-NAME=${MERCH_SRVC_NAME}&SERVICE-VERSION=1.1.0&CONSUMER-ID=${this.options.clientID}&RESPONSE-DATA-FORMAT=JSON&REST-PAYLOAD${url}`).then((result) => {
+    return getRequest(`http://${this.options.baseSvcUrl}/${MERCH_SRVC_NAME}?OPERATION-NAME=getSimilarItems&SERVICE-NAME=${MERCH_SRVC_NAME}&SERVICE-VERSION=1.1.0&CONSUMER-ID=${this.options.clientID}&RESPONSE-DATA-FORMAT=JSON&REST-PAYLOAD${url}`).then((result) => {
         return JSON.parse(result);
     }).catch((error) => {
         console.log(error);
diff --git a/src/taxonomy-api.js b/src/taxonomy-api.js
index 5da5b8f..d372a4f 100644
--- a/src/taxonomy-api.js
+++ b/src/taxonomy-api.js
@@ -12,7 +12,7 @@ const getDefaultCategoryTreeId = function (marketPlaceId) {
     marketPlaceId = upperCase(marketPlaceId);
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
-    return makeRequest('api.ebay.com', `/commerce/taxonomy/v1_beta/get_default_category_tree_id?marketplace_id=${marketPlaceId}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/commerce/taxonomy/v1_beta/get_default_category_tree_id?marketplace_id=${marketPlaceId}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
@@ -26,7 +26,7 @@ const getCategoryTree = function (categoryTreeId) {
     if (!categoryTreeId) categoryTreeId = 0;
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
-    return makeRequest('api.ebay.com', `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
@@ -42,7 +42,7 @@ const getCategorySubtree = function (categoryTreeId, categoryId) {
     if (!categoryId) throw new Error("Missing Categor id \n Refer documentation here https://developer.ebay.com/api-docs/commerce/taxonomy/resources/category_tree/methods/getCategorySubtree#h2-samples");
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
-    return makeRequest('api.ebay.com', `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_category_subtree?category_id=${categoryId}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_category_subtree?category_id=${categoryId}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
@@ -58,7 +58,7 @@ const getCategorySuggestions = function (categoryTreeId, keyword) {
     if (!keyword) throw new Error("Missing keyword \n Refer documentation here https://developer.ebay.com/api-docs/commerce/taxonomy/resources/category_tree/methods/getCategorySuggestions");
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
-    return makeRequest('api.ebay.com', `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_category_suggestions?q=${keyword}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_category_suggestions?q=${keyword}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
@@ -73,7 +73,7 @@ const getItemAspectsForCategory = function (categoryTreeId, categoryId) {
     if (!categoryId) throw new Error("Missing Category id \n Refer documentation here https://developer.ebay.com/api-docs/commerce/taxonomy/resources/category_tree/methods/getItemAspectsForCategory#h2-samples");
     if (!this.options.access_token) throw new Error("Missing Access token, Generate access token");
     const auth = "Bearer " + this.options.access_token;
-    return makeRequest('api.ebay.com', `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_item_aspects_for_category?category_id=${categoryId}`, 'GET', this.options.body, auth).then((result) => {
+    return makeRequest(this.options.baseUrl, `/commerce/taxonomy/v1_beta/category_tree/${categoryTreeId}/get_item_aspects_for_category?category_id=${categoryId}`, 'GET', this.options.body, auth).then((result) => {
         return JSON.parse(result);
     });
 };
diff --git a/test/buildURL.test.js b/test/buildURL.test.js
index 1e40727..3fa379f 100644
--- a/test/buildURL.test.js
+++ b/test/buildURL.test.js
@@ -14,7 +14,8 @@ describe("test building url methods", () => {
             param: "keywords",
             clientID: "testID",
             limit: 6,
-            globalID: "EBAY-US"
+            globalID: "EBAY-US",
+            baseSvcUrl: 'svcs.ebay.com'
         }
         expect(buildURL.buildSearchUrl(options)).to.be.equal(expected_search_url);
     });
@@ -26,6 +27,7 @@ describe("test building url methods", () => {
             operationName: "demoShoppingName",
             param: "keywords",
             clientID: "testID",
+            baseUrl: 'open.api.ebay.com'
         }
         expect(buildURL.buildShoppingUrl(options)).to.be.equal(expected_search_url);
     });
@@ -37,7 +39,8 @@ describe("test building url methods", () => {
             operationName: "demoShoppingName",
             param: "keywords",
             clientID: "testID",
-            includeSelector: true
+            includeSelector: true,
+            baseUrl: 'open.api.ebay.com'
         }
         expect(buildURL.buildShoppingUrl(options)).to.be.equal(expected_search_url);
     });