title: PHP Stripe get balance
body: <p>I am using stripe payment gateway with PHP. I need to retrieve the balance amount available in my account to initiate a transfer. Please describe pending and available amount given below in the API response. Under what condition the available amount turns negative. I am using in test mode.</p>
  
  <pre><code>Stripe_Balance::retrieve();
  
  {
    "pending": [
      {
        "amount": 37353,
        "currency": "usd"
      }
    ],
    "available": [
      {
        "amount": -13725,
        "currency": "usd"
      }
    ],
    "livemode": false,
    "object": "balance"
  }
  </code></pre>