I'm trying to get Amazon seller data using the MWS API.The Scratchpad works fine, but when I try my own code, I get errors that indicate my signature isn't quite write. I've tried both GET and post with no luck. Any suggestions?
ERROR: SignatureDoesNotMatch The request signature we calculated does not match the signature you provided
AMAZON RECENT LIST ORDER REQUEST
<?php
$secretKey = '**************************';
$parameters = array();
// required parameters
$parameters['Action'] = 'ListOrders';
$parameters['AWSAccessKeyId'] = '*************';
$parameters['SellerId'] = '*************';
$parameters['SignatureMethod'] = 'HmacSHA256';
$parameters['SignatureVersion'] = '2';
$parameters['Timestamp'] = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time());
$parameters['Version'] = '2013-09-01';
// optional parameters
$parameters['MarketplaceId.Id.1'] = 'ATVPDKIKX0DER';
$parameters['CreatedAfter'] = '2017-10-04T04%3A00%3A00Z';
/**
* Calculate String to Sign
*
* @param array $parameters request parameters
* @return String to Sign
*/
function _calculateStringToSign(array $parameters) {
$data = "GET\n";
$data .= "mws.amazonservices.com\n";
$data .= "/Orders/2013-09-01\n";
$data .= _getParametersAsString($parameters);
return $data;
}
/**
* Convert paremeters to Url encoded query string
*/
function _getParametersAsString(array $parameters)
{
uksort($parameters, 'strcmp');
$queryParameters = array();
foreach ($parameters as $key => $value) {
$queryParameters[] = $key . '=' . _urlencode($value);
}
return implode('&', $queryParameters);
}
function _urlencode($value) {
return str_replace('%7E', '~', rawurlencode($value));
}
/**
* Computes RFC 2104-compliant HMAC signature.
*/
function _sign($stringToSign, $secretKey)
{
$hash = 'sha256';
return urlencode(base64_encode(
hash_hmac($hash, $stringToSign, $secretKey, true)
));
}
/**
* Builds up the request.
*/
function buildRequest(array $parameters, $secretKey) {
$endpoint = 'https://mws.amazonservices.com/Orders/2013-09-01';
$signature = _sign(_calculateStringToSign($parameters), $secretKey);
$parameters['Signature'] = $signature;
uksort($parameters, 'strcmp');
return $endpoint . '?' . _getParametersAsString($parameters);
}
$request = buildRequest($parameters, $secretKey);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $request);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) chrome/39.0.2171.71 Safari/537.36');
$page = curl_exec($ch);
curl_close($ch);
var_dump($page);
