Walmart退货API集成指南：PHP cURL实现与常见问题解析

<?php

// 替换为您的实际Client ID和Secret Key
define('CLIENT_ID', 'YOUR_CLIENT_ID');
define('SECRET_KEY', 'YOUR_SECRET_KEY');

/**
 * 生成一个符合GUIDv4规范的字符串。
 * WM_QOS.CORRELATION_ID 要求使用GUID。
 *
 * @return string GUIDv4字符串
 */
function generateUuidV4() {
    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
        mt_rand(0, 0xffff), mt_rand(0, 0xffff),
        mt_rand(0, 0xffff),
        mt_rand(0, 0x0fff) | 0x4000, // 设置版本号为4
        mt_rand(0, 0x3fff) | 0x8000, // 设置变体为RFC 4122
        mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
    );
}

$getTokenUrl = 'https://marketplace.walmartapis.com/v3/token';
$authorization_key = base64_encode(CLIENT_ID . ":" . SECRET_KEY);
$correlation_id_token = generateUuidV4(); // 为获取Token的请求生成GUID

$tokenHeaders = array(
    'Authorization: Basic ' . $authorization_key,
    'WM_SVC.NAME: Walmart Marketplace',
    'WM_QOS.CORRELATION_ID: ' . $correlation_id_token,
    'Content-Type: application/x-www-form-urlencoded'
);

$postFields = 'grant_type=client_credentials';

$curl = curl_init();

curl_setopt_array($curl, array(
    CURLOPT_URL => $getTokenUrl,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30, // 设置超时时间
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'POST',
    CURLOPT_POSTFIELDS => $postFields,
    CURLOPT_HTTPHEADER => $tokenHeaders,
));

$tokenResponse = curl_exec($curl);
$httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);

if ($tokenResponse === false) {
    echo "cURL Error (Token): " . curl_error($curl);
    exit;
}

$tokenData = json_decode($tokenResponse, true);
$accessToken = $tokenData['access_token'] ?? null;

if ($httpCode !== 200 || !$accessToken) {
    echo "Failed to get access token. HTTP Code: " . $httpCode . "\n";
    echo "Response: " . $tokenResponse . "\n";
    exit;
}

echo "Access Token acquired successfully: " . $accessToken . "\n";

// 在实际应用中，您可能需要将 Access Token 存储起来，例如存入数据库或缓存
// $updateData['generateToken'] = $accessToken;

?>

<?php
// ... (接上文获取Access Token的代码) ...

if (!$accessToken) {
    echo "Access Token is not available. Exiting.";
    exit;
}

$returnsApiUrl = 'https://marketplace.walmartapis.com/v3/returns';
// 示例：添加查询参数，例如获取特定时间段的退货
// $returnsApiUrl .= '?createdStartDate=2023-01-01T00:00:00.000Z&createdEndDate=2023-01-31T23:59:59.000Z';

$correlation_id_returns = generateUuidV4(); // 为退货API请求生成新的GUID

$returnsHeaders = array(
    'WM_SEC.ACCESS_TOKEN: ' . $accessToken,
    'WM_QOS.CORRELATION_ID: ' . $correlation_id_returns,
    'WM_SVC.NAME: Walmart Marketplace',
    'Content-Type: application/xml', // 根据Walmart API文档，此处可为application/xml或application/json
    'Accept: application/xml' // 明确指定期望XML响应
);

// 重置cURL句柄以进行新的请求。如果您的PHP版本低于5.5，则需要重新初始化 $curl = curl_init();
curl_reset($curl);

curl_setopt_array($curl, array(
    CURLOPT_URL => $returnsApiUrl,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => '',
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30, // 设置超时时间
    CURLOPT_FOLLOWLOCATION => true,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => 'GET',
    CURLOPT_HTTPHEADER => $returnsHeaders,
));

$