title: NoMethodError - undefined method `split' for #<Hash:...:
body: <p>I'm creating a webhook notification with:</p>
  
  <pre><code>signature, payload = Braintree::WebhookTesting.sample_notification(
    Braintree::WebhookNotification::Kind::SubMerchantAccountApproved,
    rand(10000)
  )
  </code></pre>
  
  <p>And then parsing with:</p>
  
  <pre><code> @message = Braintree::WebhookNotification.parse(signature, payload)
  </code></pre>
  
  <p>Signature and Payload responses:</p>
  
  <pre><code>{:bt_signature=&amp;gt;&amp;quot;gcsg95j47yvzpgrr|61350cd9c99cbac6a7905479a5fa061976114e51&amp;quot;, :bt_payload=&amp;gt;&amp;quot;ICAgICAgICA8bm90aWZpY2F0aW9uPgogICAgICAgICAgPHRpbWVzdGFtcCB0
   eXBlPSJkYXRldGltZSI+MjAxNS0wOS0wNFQwMjo1Nzo0NFo8L3RpbWVzdGFt
   cD4KICAgICAgICAgIDxraW5kPnN1Yl9tZXJjaGFudF9hY2NvdW50X2FwcHJv
   dmVkPC9raW5kPgogICAgICAgICAgPHN1YmplY3Q+CiAgICAgICAgICAgICAg
   ICAgICAgPG1lcmNoYW50X2FjY291bnQ+CiAgICAgICAgICA8aWQ+MzEzNDwv
   aWQ+CiAgICAgICAgICA8bWFzdGVyX21lcmNoYW50X2FjY291bnQ+CiAgICAg
   ICAgICAgIDxpZD5tYXN0ZXJfbWFfZm9yXzMxMzQ8L2lkPgogICAgICAgICAg
   ICA8c3RhdHVzPmFjdGl2ZTwvc3RhdHVzPgogICAgICAgICAgPC9tYXN0ZXJf
   bWVyY2hhbnRfYWNjb3VudD4KICAgICAgICAgIDxzdGF0dXM+YWN0aXZlPC9z
   dGF0dXM+CiAgICAgICAgPC9tZXJjaGFudF9hY2NvdW50PgoKICAgICAgICAg
   IDwvc3ViamVjdD4KICAgICAgICA8L25vdGlmaWNhdGlvbj4K
   &amp;quot;}
  </code></pre>
  
  <p>I keep getting the error:</p>
  
  <pre><code>NoMethodError - undefined method `split' for #&lt;Hash:0x007fdb043e7b50&gt;:
  
  App backtrace
  -------------
  
   -  () Users/johnmolina/Documents/Rails/Nyvur/app/controllers/webhooks_controller.rb:30:in `handle'
   -  () Users/johnmolina/Documents/Rails/Nyvur/bin/rails:8:in `&lt;top (required)&gt;'
   -  () Users/johnmolina/Documents/Rails/Nyvur/bin/spring:16:in `&lt;top (required)&gt;'
  </code></pre>
  
  <p>I couldn't find much in the source code, and was wondering if someone else has encountered this issue also?</p>
  
  <p>Here's the <a href="http://pastebin.com/fBniV3Vw" rel="nofollow">Webhooks Controller</a>.</p>