Use the Amazon API to Get Product Prices Easy Guide!

This tutorial helps you to learn how you can Use the Amazon API to Get Product Prices.

You can use the Amazon API to Get Product Prices, item description, customer reviews, product images, quantity available and other details of any product listed on various Amazon websites.

The region (such as “com” for the US or “es” for Spain) and 10-digit ASIN of any product are passed to the getAmazonPrice() method. The response is given back as JSON, which Google Scripts‘  Amazon Price Tracker can easily parse. However, you cannot use this method to retrieve Kindle Books prices as they are not yet supported by the Amazon API.

<?php

// Region code and Product ASIN
$response = getAmazonPrice("com", "B00KQPGRRE");

function getAmazonPrice($region, $asin) {

        $xml = aws_signed_request($region, array(
                "Operation" => "ItemLookup",
                "ItemId" => $asin,
                "IncludeReviewsSummary" => False,
                "ResponseGroup" => "Medium,OfferSummary",
        ));

        $item = $xml->Items->Item;
        $title = htmlentities((string) $item->ItemAttributes->Title);
        $url = htmlentities((string) $item->DetailPageURL);
        $image = htmlentities((string) $item->MediumImage->URL);
        $price = htmlentities((string) $item->OfferSummary->LowestNewPrice->Amount);
        $code = htmlentities((string) $item->OfferSummary->LowestNewPrice->CurrencyCode);
        $qty = htmlentities((string) $item->OfferSummary->TotalNew);

        if ($qty !== "0") {
                $response = array(
                        "code" => $code,
                        "price" => number_format((float) ($price / 100), 2, '.', ''),
                        "image" => $image,
                        "url" => $url,
                        "title" => $title
                );
        }

        return $response;
}

function getPage($url) {

        $curl = curl_init($url);
        curl_setopt($curl, CURLOPT_FAILONERROR, true);
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        $html = curl_exec($curl);
        curl_close($curl);
        return $html;
}

function aws_signed_request($region, $params) {

        $public_key = "PUBLIC_KEY";
        $private_key = "PRIVATE_KEY";

        $method = "GET";
        $host = "ecs.amazonaws." . $region;
        $host = "webservices.amazon." . $region;
        $uri = "/onca/xml";

        $params["Service"] = "AWSECommerceService";
        $params["AssociateTag"] = "affiliate-20"; // Put your Affiliate Code here
        $params["AWSAccessKeyId"] = $public_key;
        $params["Timestamp"] = gmdate("Y-m-d\TH:i:s\Z");
        $params["Version"] = "2011-08-01";

        ksort($params);

        $canonicalized_query = array();
        foreach ($params as $param => $value) {
                $param = str_replace("%7E", "~", rawurlencode($param));
                $value = str_replace("%7E", "~", rawurlencode($value));
                $canonicalized_query[] = $param . "=" . $value;
        }

        $canonicalized_query = implode("&", $canonicalized_query);

        $string_to_sign = $method . "\n" . $host . "\n" . $uri . "\n" . $canonicalized_query;
        $signature = base64_encode(hash_hmac("sha256", $string_to_sign, $private_key, True));
        $signature = str_replace("%7E", "~", rawurlencode($signature));

        $request = "http://" . $host . $uri . "?" . $canonicalized_query . "&Signature=" . $signature;
        $response = getPage($request);

        var_dump($response);

        $pxml = @simplexml_load_string($response);
        if ($pxml === False) {
                return False;// no xml
        } else {
                return $pxml;
        }
}

?>

Your public and private access keys must be obtained from the AWS Management Console and changed in the PHP code. For the country-specific Amazon Affiliate programme, you must also enter your Amazon Affiliate ID. For instance, even though you can use the same Access Keys with the code, the id for Amazon US and Amazon UK would differ.

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