One-Page Commerce Checkout Does anyone have any recommendation on how to reformat the Commerce checkout workflow to be on one page? More specifically, how to pass the address/customer info before the payment info without having to redirect to another page? I've tried combining them into one form without success.

Thanks!
You won't be able to collect all information and take payment using one form/action. The customer information is added to the cart using commerce/cart/updateCart and payment is processed using commerce/payments/pay.

To show the available shipping methods to a customer, Craft Commerce needs to know the shipping address to match against the rules you've set up. For this reason you'll need to split your checkout into separate forms.

I have built a "one-page" checkout with 'Customer Details', 'Delivery Method' and 'Payment' sections. Each section has a 'Continue' button that submits the information and updates the cart. Each section has the same redirection URL (/checkout) so the user lands back on the "one-page". 

If you wanted to do away with 'Continue' buttons, you could use Javascript to submit the customer's information and receive a JSON response. This would include the available shipping methods and the cart totals which you'd use to update the page without the need for a refresh.