Configure ecommerce tracking with Google Analytics

[dbarretoAcro]

Hi,

I have to add a google analytics tracking script in the ordering process of my shop (1.6.0.9). The code looks like this :

// First script – start ecommerce tracking
ga('require', 'ecommerce');  

// Second script – for each order
ga('ecommerce:addTransaction', {   
'id': '1234',          
'affiliation': 'credit card',   
'revenue': '840.00',   
'shipping': '0',        
'tax': '34.80'         
});  

// Third function - Must be called for each product in an order 
ga('ecommerce:addItem', {   
'id': '1234',                      
'name': 'Product Name',              
'sku': 'Product Name',               
'category': 'Category Name', 
'price': '840.00',                  
'quantity': '1'                    
});  

// Fourth function - Send the data to Google Analytics 
ga('ecommerce:send'); 

I have two problems, I do not know where do i have to put this code and I do not know wich variables to use to get all the values I need.

Thanks in advance for your help