使用 PHP 的亚马逊 MWS API 没有显示结果

Question

I have been using amazon mws API for developing a project to find Lowest Priced offers, It works fine with action ListMatchingProducts and GetMatchingProduct but when it comes to GetLowestPricedOffersForASIN, it shows no result in XML output

"This XML file does not appear to have any style information associated with it. The document tree is shown below."

My PHP File Here:

 <?php $param = array(); $param['AWSAccessKeyId'] = ''; $param['Action'] = 'GetLowestPricedOffersForASIN'; $param['SellerId'] = ''; $param['SignatureMethod'] = 'HmacSHA256'; $param['SignatureVersion'] = '2'; $param['Timestamp'] = gmdate("Ymd\\TH:i:s.\\\\0\\\\0\\\\0\\\\Z", time()); $param['Version'] = '2011-10-01'; $param['MarketplaceId'] = 'ATVPDKIKX0DER'; $param['ItemCondition'] = 'used'; $param['ASIN'] = '0439139600'; $secret = ''; $url = array(); foreach ($param as $key => $val) { $key = str_replace("%7E", "~", rawurlencode($key)); $val = str_replace("%7E", "~", rawurlencode($val)); $url[] = "{$key}={$val}"; } sort($url); $arr = implode('&', $url); $sign = 'GET' . "\\n"; $sign .= 'mws.amazonservices.com' . "\\n"; $sign .= '/Products/2011-10-01' . "\\n"; $sign .= $arr; $signature = hash_hmac("sha256", $sign, $secret, true); $signature = urlencode(base64_encode($signature)); $link = "https://mws.amazonservices.com/Products/2011-10-01?"; $link .= $arr . "&Signature=" . $signature; $ch = curl_init($link); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type: application/xml')); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); $response = curl_exec($ch); $info = curl_getinfo($ch); curl_close($ch); header('Content-type:text/xml'); echo $response;

I can't put AWSAccessKeyID, Secret and SellerID here...

Answer 1

Your main problem is, that you use GET instead of POST. This version of your code works:

$param = array();
$param['AWSAccessKeyId']   = ''; 
$param['Action']           = 'GetLowestPricedOffersForASIN';
$param['MarketplaceId']    = 'A1PA6795UKMFR9';
$param['SellerId']         = ''; 
$param['ASIN']             = 'B002BYQIWM'; 
$param['ItemCondition']    = 'New'; 
$param['SignatureMethod']  = 'HmacSHA256';  
$param['SignatureVersion'] = '2'; 
$param['Timestamp']        = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time());
$param['Version']          = '2011-10-01'; 
$secret = '';
$url = array();
foreach ($param as $key => $val) {
                    $key = str_replace("%7E", "~", rawurlencode($key));
                        $val = str_replace("%7E", "~", rawurlencode($val));
                        $url[] = "{$key}={$val}";
}

sort($url);

$arr   = implode('&', $url);

$sign  = 'POST' . "\n";
$sign .= 'mws.amazonservices.de' . "\n";
$sign .= '/Products/2011-10-01' . "\n";
$sign .= $arr;

$signature = hash_hmac("sha256", $sign, $secret, true);
$s64 = base64_encode($signature);

$signature = urlencode($s64);
$link  = "https://mws.amazonservices.de/Products/2011-10-01";
$arr .= "&Signature=" . $signature;

$ch = curl_init($link);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded', 'Accept:'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $arr); 
$response = curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);
echo $response;

I have used curl_setopt($ch, CURLOPT_VERBOSE, true); to debug the response from server. Your code did not produced any http body to output, but this http header HTTP/1.1 405 Method Not Allowed . Changing to POST solved your problem.