Enhanced E-Commerce Tracking in Google Analytics

Ecommerce Plug-in (ecommerce.js)

Google has introduced an enhanced Ecommerce Plug-in for analytics.js (universal analytics) which enables the measurement of user interactions with products on ecommerce websites across the user's shopping experience, including: product impressions, product clicks, viewing product details, adding a product to a shopping cart, initiating the checkout process, transactions, and refunds.

Advantages of E-Commerce Plug-in

By using Ecommerce Plug-in the below advantages can be availed.

• Identify the brand, category, name, SKU, price of products that have been viewed. 
• Transaction ID, Affiliate network (if any), Revenue, Tax, Shipping Cost and Coupon Code (if any) of the product which has been sold. 
• Checkout, Purchase, Refund of the product that has been sold.

Steps to implement enhanced Ecommerce Plug-in

If you've already implemented Ecommerce tracking and want to start using Enhanced Ecommerce tracking the below steps has to be followed:

• Ecommerce Plug-in requires universal analytics, if you're using Classic Analytics (ga.js) you have to migrate your property to analytics.js. 
• Add an additional tracker for a newly created property and tag/enable Enhanced Ecommerce for the new property. 
• To migrate from the existing ecommerce plug-in to the enhanced ecommerce plug-in, current analytics.js users should be removed and replaced references with enhanced ecommerce code.

Detailed Procedure to add E-Commerce Plug-in is stated below in the link

https://developers.google.com/analytics/devguides/collection/analyticsjs/enhanced-ecommerce

Steps to Migrate to Universal Analytics

Step 1: Transfer Property

• Transfer your properties to Universal Analytics from the Google Analytics Admin page. You may also customize session and campaign timeout periods. 
• Only users with Edit permissions may initiate the property transfer from the Google Analytics Admin page. 
• The transfer takes minutes to initiate, but you should allow 24 - 48 hours for it to complete. 
• When the transfer is completed, the property is ready to receive data from Universal Analytics tracking code. 
• Move on to Step 2 after the transfer is complete.

Step 2: Update Tracking Code (optional)

• Replace existing tracking code with new Universal Analytics tracking code. 
• A developer (or person with technical knowledge) should complete this step in your development environment (web pages, SDKs, etc.). 
• The time it takes to update your tracking code will vary depending on your current implementation and your tracking needs. 
• When this step is completed, you will have access to the full benefits of Universal Analytics, including new reports and features. 
• After completing this step, your full upgrade to Universal Analytics is complete.

Detailed procedure to migrate to universal analytics is stated below in the link

https://developers.google.com/analytics/devguides/collection/upgrade/reference/gajs-analyticsjs