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POAmazon FPS Return URL Validation with verifySignature PHP api returning "InvalidSignature"
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  1. POAmazon FPS Return URL Validation with verifySignature PHP api returning "InvalidSignature"
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    copied!<p>I'm trying to validate the return URL of Amazon FPS CBUI after the client confirm the payment in the CBUI. I 'm using the code examples from Amazon </p> <pre><code> public static function test() { $utils = new Amazon_FPS_SignatureUtilsForOutbound(); $params["signature"] = $_GET['signature']; $params["expiry"] = "10/2016"; $params["signatureVersion"] = $_GET['signatureVersion']; $params["signatureMethod"] = $_GET['signatureMethod']; $params["certificateUrl"] = $_GET['certificateUrl']; $params["tokenID"] = $_GET['tokenID']; $params["status"] = $_GET['status']; $params["callerReference"] = $_GET['callerReference']; $urlEndPoint = "http://mydomain.com/Amazon/IpnReturnUrlValidation/Samples/ReturnUrlVerificationSampleCode.php"; //Your return url end point. print "Verifying return url signed using signature v2 ....\n"; //return url is sent as a http GET request and hence we specify GET as the http method. //Signature verification does not require your secret key print "Is signature correct: " . $utils-&gt;validateRequest($params, $urlEndPoint, "GET") . "\n"; } </code></pre> <p>All the parameters that I use from the superglobal variable $_GET have the correct value (I think) but I always get this response:</p> <pre><code>&lt;Response&gt;&lt;Errors&gt;&lt;Error&gt;&lt;Code&gt;InvalidSignature&lt;/Code&gt;&lt;Message&gt;The request signature we calculated does not match the signature you provided.&lt;/Message&gt;&lt;/Error&gt;&lt;/Errors&gt;&lt;RequestID&gt;bb922e49-af5e-43ba-a3d0-464ce2851222&lt;/RequestID&gt;&lt;/Response&gt; </code></pre> <p>I also compared the value from the signature param that Amazon returns vs the one I send to the VerifySignature API and they look the same.</p> <p>Thanks in advance for any help.</p>
 

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