ok now we’re getting somewhere 
Question 1:
If a customer submits a payment using an EXISTING credit card, does it still produce a card_nonce (source_id) ?
Question 2:
If a customer submits a payment using an EXISTING credit card, I only need the card_nonce info in the PHP to make that payment and save the credit card correct? Square will somehow have access to the credit card info etc so I don’t need to get the ones produced in the javascript?
What I’m trying to figure out is if I ever need the credit card info details that the javascript is producing before submitting the PHP form.