title: facebook, credits payment process error, how to?
body: <p>I implement the example from facebook credits, and create an test app, added the <code>callback.php</code> in the Callback Url, place my keys correctly. but I get this error:</p>
  
  <pre><code>Sorry, but we're having trouble processing your payment. You have not been charged for this transaction. Please try again.
  </code></pre>
  
  <p>I am trying to create a few buttons with different monetary values. Like:</p>
  
  <pre><code>Click to get 100 credits
  Click to get 1000 credits
  </code></pre>
  
  <p>If I use this generic code, I get the payment window just fine, but I can't see my products there, I can only choose from already made presets :</p>
  
  <pre><code>function buyMore(){
      // calling the API ...
      var obj = {
          app_id: 'xxxxxxxxxxxxxxxxxxxxx',
          method: 'pay',
          order_info: n, 
          purchase_type: 'item',
          credits_purchase: true
      };
  </code></pre>
  
  <p>to show the user my monetary presets I think I need to pass different values to the function:</p>
  
  <pre><code>&lt;p&gt;&lt;a onclick="buyMore('100'); return false;"&gt;Buy More Credits 100&lt;/a&gt;&lt;/p&gt;
  &lt;p&gt;&lt;a onclick="buyMore('1000'); return false;"&gt;Buy More Credits 1000&lt;/a&gt;&lt;/p&gt;
  
  
  function buyMore(price) {
      var order_info = { 
          "title":'title',
          "description":'description',
          "price":price,
          "image_url":'http://....img_url',
          "product_url":'http://....product_url'
      };
  
      // calling the API ...
      var obj = {
          app_id: '153230661424821',
          method: 'pay',
          order_info: order_info,
          purchase_type: 'item'
      };
  }
  </code></pre>
  
  <p>Not sure if I got it right.</p>
  
  <p>Can anyone push me in the right direction?</p>