How can I create a “Buy now” button, to add a specific product in cart and go immediately to checkout ?
Commerce treats those things as 2 separate actions that need to be performed sequentially.
You could mimic it with AJAX: send the standard add to cart request, on complete send a request with data checkout=1 to prepare the order for checkout, and then redirect to the checkout.
OK, I was think about that 
Thank you !
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