Parse Soap Response with SimpleXML problem

So I am making a soap call in PHP using fopen.  I cannot figure out how to parse to a specific value in the soap env response to save my life.

I have been Topekaing( errr Googleing) this for hours and have tried everything from declare namespaces to removing the colons etc...

Any help woudl be appreciated!

//soap req env

$contents = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
  <soapenv:Body>
    <payRequest>
      <actionType>PAY</actionType>
      <cancelUrl>http://myCancelUrl.com</cancelUrl>
      <currencyCode>USD</currencyCode>
      <returnUrl>http://myReturnUrl.com</returnUrl>
      <receiverList>
        <receiver>
          <amount>10</amount>
          <email>newsel_1245945819_biz@leezacentral.com</email>
        </receiver>
      </receiverList>
      <requestEnvelope>
        <errorLanguage>en_US</errorLanguage>
      </requestEnvelope>
    </payRequest>
  </soapenv:Body>
</soapenv:Envelope>';

//Soap Response

<?xml version='1.0' encoding='utf-8'?>
	<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
		<soapenv:Header />
		<soapenv:Body>
			<ns2:PayResponse xmlns:ns2="http://svcs.paypal.com/types/ap">
				<responseEnvelope>
					<timestamp>2010-04-02T10:07:57.246-07:00</timestamp>
					<ack>Success</ack>
					<correlationId>7fe65d08e725a</correlationId>
					<build>1238639</build>
				</responseEnvelope>
				<payKey>AP-32D204908S5562638</payKey>
				<paymentExecStatus>CREATED</paymentExecStatus>
			</ns2:PayResponse>
		</soapenv:Body>
	</soapenv:Envelope>

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