How to create this same functionality

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Hello Everyone, i'm a 10+ years developer, and i was asked to create a funcionality like this one:


Steps to see the funtionality:

1 - Acess this Link to the example shop

2 - Add a product to cart,

3 - When you click to checkout in the cart, i was redirected to another checkout page.


I never developed anything for shopify before, and i need some path to follow so i can create the same functionality, i do not know which Shopify Developer Tool to do that job.


Thanks in advance.