Hello,
Follow these steps
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Setup the Nodejs project locally
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Design the cart page
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You still need to edit the theme code in order to add the script/style tags
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Generate the static HTML file from your node project using Webpack
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use the Shopify Ajax API to update/add/remove the cart items (https://shopify.dev/docs/ajax-api/reference/cart)
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Once you fulfiled all the above step message me again and I’ll tell you next steps.
Remember that you eventually need to modify some code in the themes section in order to use your own design. If you are still not getting it I can build this plugin for you and of-course it will not be free ![]()
If you really want to learn. Follow the above steps and the steps I have mentioned in my previous posts and you will get what you need once you start working on it you will get a better understanding and your options.