title: How can my clients update their card information on Stripe?
body: <p>I currently use Stripe to sell my product, namely a recurring subscription. 
  I sometimes see a recurring payment failed to be completed, but Stripe, unlike PayPal seems to not support out of the box email notifications to let the customer know that his payment has failed. </p>
  
  <p>So, my questions are: </p>
  
  <ol>
  <li>How can I email my clients to notify them about their payment having failed? ( tell it as if I am 7 year old please, I am not a programmer )</li>
  <li>Most importantly, how can my clients update their card information?</li>
  </ol>
  
  <p>Thank you very much. </p>