I have built a site fully with nodeJS and I want to connect this site with Shopify. Exactly, I want to begin the checkout page from my site, from to push a button here named "go to checkout" and to add my items, notes, attributes of each item and it redirects to the checkout page of Shopify and that customer to finish the checkout. filling your own information like shipping and billing. How can I link these two elements? I was reading that it is reached with the Storefront API, is it correct?
I hope you soon answer.