title: Stripe making multiple customers with same email address
body: <p>I have stripe check out with php.  It creates customers and charges them.  I want to create a donation form where if same customer comes back and gives with same email address that Stripe doesn't create another customer but charges the existing customer with additional payments.  Is this possible?  Or does the checkout always create new customer with new customer id?</p>
  
  <p>Here is my charge.php</p>
  
  <pre><code>&lt;?php
      require_once('config.php');
  
      $token  = $_POST['stripeToken'];
  
      if($_POST) {
        $error = NULL;
  
        try{
          if(!isset($_POST['stripeToken']))
            throw new Exception("The Stripe Token was not generated correctly");
              $customer = Stripe_Customer::create(array(
                'card'  =&gt; $token,
                'email' =&gt;  $_POST['stripeEmail'],
                'description' =&gt; 'Thrive General Donor'
              ));
  
              $charge = Stripe_Charge::create(array(
                'customer' =&gt; $customer-&gt;id,
                'amount'   =&gt; $_POST['donationAmount'] * 100,
                'currency' =&gt; 'usd'
              ));
        }
        catch(Exception $e) {
          $eror = $e-&gt;getMessage();
        }
  
  
      }
  
  ?&gt;
  </code></pre>