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How do I get checkout form, items in order, and order summary values

Hello,

I am having trouble integrating Stripe payments on my checkout page. I was thinking to grab all user data from the page and send to my Airtable backend. I want to be able to pull the values from the checkout form, items in order, and order summary sections.

Anyone know how?

I tried function like below, but it is inconsistent:
var zipcodeTextField = document.getElementById(‘zipcode’);
zipcodeTextField.onkeyup = function(){
zipcode = document.getElementById(‘zipcode’).value;
}