Unable to Send Cart Details to Paypal - javascript

I am using this https://cdnjs.cloudflare.com/ajax/libs/minicart/3.0.6/minicart.min.js script to render a cart for my e-commerce website. This works pretty fine as I can add and remove items from the cart and view the subtotal. However, when it comes to linking with paypal (the main reason I think it was designed), I am unable to submit the cart details, i.e. all items' names and prices along with the total to paypal for processing payment. Can someone have a look and help me understand how to do this. At least, retrieve the price and quantity of each item and the total. If I can access these at any point in my application, that would be a great start.
Please find here a snippet of my use of the script to add an item to cart.
This is my inclusion of the javascript.
This is how it looks like in view.

You have add the shopping cart variables to pass your cart details to PayPal
Please find the below link,
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/#shopping-cart-variables

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We are doing some custom changes to our WooCommerce.
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Add product to cart on website before it is live

Hello I am looking to add a product to my cart on kicksusa.com using a product ID code. The ID code is 349008 and I was wondering how I could add early by altering the code of the webpage. Thank you.
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http://www.kicksusa.com/checkout/cart/add/uenc/,,/product/349008/form_key/wf3zkNJLvH0W7uCi/
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