将post JSON发送到api - 没有输出

Question

我正在使用新的API，我正在尝试了解如何正确登录并向api发送帖子请求。

以下是一些截图：

此外，如果每次发送请求时都要进行此身份验证，或者??（在备注中每8小时说明一次令牌）

这是我到目前为止所做的，但是我没有得到print_r的输出（可能是因为我没有按照说明中所示进行身份验证（我不知道如何正确操作）：

  $data_string = '{
    "nameOnCard":"Johnny",
    "userDetail": {
        "lastName":"Smith",
        "firstName":"John",
        "middleInitial":"xx",
        "dateOfBirth":"1975-02-28",
        "addressLine1":"222333 PEACHTREE PLACE",
        "city":"Winchester",
        "zipCode":"GU14 7JF",
        "country":"GB",
        "mobileNumber":"2071234567",
        "landlineNumber":"57647564234",
        "email":"demouser@mailinator.com",
        "currencyCode":"EUR",
        "externalReferenceId":"WC34930",
        "registeredFromIp":"10.10.10.10",
        "acceptTermsAndConditions": true,
        "acceptEsign" : true
    },
    "channelType": "1",
    "cardProgramId": "0",
    "localeTime": "2013-06-04T00:00:00.000+05:00",
    "refId": "1",
    "dlvAddress": {
        "addressLineOne":"222333 DELIVERY PLACE",
        "city":"Winchester",
        "zipCode":"GU14 7JF",
        "country":"GB"
    }
}';



    $ch = curl_init('https://wcapi.wavecrest.in/apisandbox/cards');
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            'Content-Type: application/json',
            'Developerid: xxxxxxxxxx',
            'Developerpassword: xxxxxxx',
            'X-Method-Override: login',
            'Content-Length: ' . strlen($data_string))
    );

    $result = curl_exec($ch);
    print_r($result);

如果有人能帮助我，我将不胜感激，谢谢！

编辑：其他帖子变为非活动状态，编辑它对我没有帮助。