diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..896022e
Binary files /dev/null and b/.DS_Store differ
diff --git a/index.js b/index.js
index 7c51396..312837c 100644
--- a/index.js
+++ b/index.js
@@ -1,85 +1,91 @@
-'use strict';
+"use strict";
 
 const platforms = {
-	amazon: require('./lib/amazon'),
-	apple: require('./lib/apple'),
-	google: require('./lib/google'),
-	roku: require('./lib/roku')
+  amazon: require("./lib/amazon"),
+  apple: require("./lib/apple"),
+  google: require("./lib/google"),
+  roku: require("./lib/roku"),
+  vizio: require("./lib/vizio"),
 };
 
 const promisify = (fn) => {
-	return (...args) => {
-		return new Promise((resolve, reject) => {
-			fn(...args, (err, res) => {
-				return (err ? reject(err) : resolve(res));
-			});
-		});
-	};
+  return (...args) => {
+    return new Promise((resolve, reject) => {
+      fn(...args, (err, res) => {
+        return err ? reject(err) : resolve(res);
+      });
+    });
+  };
 };
 
 function verifyPayment(platform, payment, cb) {
-	function syncError(error) {
-		process.nextTick(function () {
-			cb(error);
-		});
-	}
+  function syncError(error) {
+    process.nextTick(function () {
+      cb(error);
+    });
+  }
 
-	if (!payment) {
-		return syncError(new Error('No payment given'));
-	}
+  if (!payment) {
+    return syncError(new Error("No payment given"));
+  }
 
-	const engine = platforms[platform];
+  const engine = platforms[platform];
 
-	if (!engine) {
-		return syncError(new Error(`Platform ${platform} not recognized`));
-	}
+  if (!engine) {
+    return syncError(new Error(`Platform ${platform} not recognized`));
+  }
 
-	engine.verifyPayment(payment, function (error, result) {
-		if (error) {
-			return cb(error);
-		}
+  engine.verifyPayment(payment, function (error, result) {
+    if (error) {
+      return cb(error);
+    }
 
-		result.platform = platform;
+    result.platform = platform;
 
-		cb(null, result);
-	});
+    cb(null, result);
+  });
 }
 
 function cancelSubscription(platform, payment, cb) {
-	function syncError(error) {
-		process.nextTick(function () {
-			cb(error);
-		});
-	}
-
-	if (!payment) {
-		return syncError(new Error('No payment given'));
-	}
-
-	const engine = platforms[platform];
-
-	if (!engine) {
-		return syncError(new Error(`Platform ${platform} not recognized`));
-	}
-
-	if (!engine.cancelSubscription) {
-		return syncError(new Error(`Platform ${platform
-		} does not have cancelSubscription method`));
-	}
-
-	engine.cancelSubscription(payment, function (error, result) {
-		if (error) {
-			return cb(error);
-		}
-
-		cb(null, result);
-	});
+  function syncError(error) {
+    process.nextTick(function () {
+      cb(error);
+    });
+  }
+
+  if (!payment) {
+    return syncError(new Error("No payment given"));
+  }
+
+  const engine = platforms[platform];
+
+  if (!engine) {
+    return syncError(new Error(`Platform ${platform} not recognized`));
+  }
+
+  if (!engine.cancelSubscription) {
+    return syncError(
+      new Error(`Platform ${platform} does not have cancelSubscription method`)
+    );
+  }
+
+  engine.cancelSubscription(payment, function (error, result) {
+    if (error) {
+      return cb(error);
+    }
+
+    cb(null, result);
+  });
 }
 
 exports.verifyPayment = (platform, payment, cb) => {
-	return (cb ? verifyPayment(platform, payment, cb) : promisify(verifyPayment)(platform, payment));
+  return cb
+    ? verifyPayment(platform, payment, cb)
+    : promisify(verifyPayment)(platform, payment);
 };
 
 exports.cancelSubscription = (platform, payment, cb) => {
-	return (cb ? cancelSubscription(platform, payment, cb) : promisify(cancelSubscription)(platform, payment));
+  return cb
+    ? cancelSubscription(platform, payment, cb)
+    : promisify(cancelSubscription)(platform, payment);
 };
diff --git a/lib/.DS_Store b/lib/.DS_Store
new file mode 100644
index 0000000..564f9bc
Binary files /dev/null and b/lib/.DS_Store differ
diff --git a/lib/amazon/index.js b/lib/amazon/index.js
index ce7d16b..549cfab 100644
--- a/lib/amazon/index.js
+++ b/lib/amazon/index.js
@@ -4,7 +4,8 @@ const assert = require('assert');
 const https = require('../https');
 
 const apiUrl = {
-	production: 'https://appstore-sdk.amazon.com/version/1.0/verifyReceiptId/developer/'
+	production: 'https://appstore-sdk.amazon.com/version/1.0/verifyReceiptId/developer/',
+	sandbox: 'https://appstore-sdk.amazon.com/sandbox/version/1.0/verifyReceiptId/developer/'
 };
 
 function parseResult(resultString) {
@@ -38,7 +39,8 @@ exports.verifyPayment = function (payment, cb) {
 		});
 	}
 
-	const requestUrl = `${apiUrl.production + payment.secret}/user/${payment.userId}/receiptId/${payment.receipt}`;
+	const url = payment.sandbox ? apiUrl.sandbox : apiUrl.production
+	const requestUrl = `${url + payment.secret}/user/${payment.userId}/receiptId/${payment.receipt}`;
 
 	https.get(requestUrl, null, function (error, res, resultString) {
 		if (error) {
diff --git a/lib/vizio/index.js b/lib/vizio/index.js
new file mode 100644
index 0000000..d9a7e92
--- /dev/null
+++ b/lib/vizio/index.js
@@ -0,0 +1,66 @@
+"use strict";
+
+const assert = require("assert");
+const https = require("../https");
+
+const apiUrl = {
+  sandbox: "https://preprod.api.developer-vizio.external.plat.vizio.com",
+  production: "https://api.developer-vizio.external.plat.vizio.com",
+};
+
+function parseResult(resultString) {
+  const result = JSON.parse(resultString);
+  return {
+    receipt: result,
+    transactionId: result.data.orderNumber,
+    productId: result.data.contentId,
+    purchaseDate: new Date(result.data.createdDate).getTime(),
+    expirationDate: null,
+  };
+}
+
+exports.verifyPayment = function (payment, cb) {
+  try {
+    assert.equal(typeof payment.partner, "string", "Partner must be a string");
+    assert.equal(typeof payment.receipt, "string", "Receipt must be a string");
+    assert.equal(typeof payment.secret, "string", "Secret must be a string");
+  } catch (error) {
+    return process.nextTick(function () {
+      cb(error);
+    });
+  }
+
+  const url = payment.sandbox ? apiUrl.sandbox : apiUrl.production;
+  const requestUrl = `${url}/entitlements/batch/v1/transactions/${payment.partner}/orders/${payment.receipt}`;
+  https.get(
+    requestUrl,
+    { headers: { Authorization: payment.secret } },
+    function (error, res, resultString) {
+      if (error) {
+        return cb(error);
+      }
+
+      if (res.statusCode !== 200) {
+        return cb(
+          new Error(
+            `Received ${res.statusCode} status code with body: ${resultString}`
+          )
+        );
+      }
+
+      let resultObject = null;
+
+      try {
+        resultObject = parseResult(resultString);
+      } catch (error) {
+        return cb(error);
+      }
+
+      if (resultObject.error) {
+        return cb(new Error(resultObject.error));
+      }
+
+      cb(null, resultObject);
+    }
+  );
+};
diff --git a/package.json b/package.json
index c475989..c4b8eb2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
-  "name": "iap",
-  "version": "1.1.1",
+  "name": "@fanmio/iap",
+  "version": "1.1.5",
   "description": "In-app purchase validation for Apple, Google, Amazon, Roku",
   "main": "index.js",
   "scripts": {