title: Firebase and Stripe: Storing users credit card information
body: <p>I am programming an iOS application that needs to store users credit card information for them to change and also so that payments can happen without entering the card in each time.</p>
  
  <p>I'm using Firebase as my database and Stripe to allow purchases to go through. Heroku handles all of the stripe tokens.</p>
  
  <p>Right now, I have it so that the user has to keep entering a card in each time they want to make a payment, but I would like to store this information securely so that they don't have to do this.</p>
  
  <p>Can I store it on Firebase? Is there an easier safe way to store credit card information for each user?</p>