title: save card to customer with Stripe.js
body: <p>How do I save a card to a customer with Stripe.js?  </p>
  
  <p>I don't want to change them at this point.  I just want to save the credit card info to their stripe account so I can use it later.</p>
  
  <p>It seems like I'd need to use createToken from Stipe.js.  But my understanding is that this is a one time use token.  I want to save the credit card info for later use.  </p>
  
  <p>This seems to be a similar question: <a href="https://stackoverflow.com/questions/18374282/stripe-payment-save-token-and-customer-and-make-payment-later-from-token">Stripe Payment: Save token and customer and make payment later from token</a>
  but the solution isn't clear.  I'm not sure if it means for the customer I need to save card=token and everything will work fine. </p>