<?php
$methodParams = '{
    "storage_id": "bl_1",
    "product_id": "",
    "ean": "983628103943",
    "sku": "EPL-432",
    "name": "Harry Potter i kamie\u0144 filozoficzny",
    "quantity": 12,
    "price_brutto": 19.5,
    "price_wholesale_netto": 12.44,
    "tax_rate": 23,
    "weight": 0.25,
    "description": "Podstawowy opis ksi\u0105\u017cki",
    "description_extra1": "Opis dodatkowy dotycz\u0105cy np. ca\u0142ej kategorii produkt\u00f3w",
    "description_extra2": "Drugi opis dodatkowy - np. znaczniki IMG ze zdj\u0119ciami z zewnetrznego serwera",
    "description_extra3": "Trzeci opis dodatkowy",
    "description_extra4": "Czwarty opis dodatkowy",
    "man_name": "Media Rodzina",
    "category_id": "100583",
    "images": [
        "url:http:\/\/placehold.it\/250x250\/image.jpg",
        "url:http:\/\/placehold.it\/250x250\/image2.jpg",
        "url:http:\/\/placehold.it\/350x350\/image34.jpg"
    ],
    "features": [
        {
            "name": "Oprawa",
            "value": "Twarda"
        },
        {
            "name": "Ilo\u015b\u0107 stron",
            "value": "300"
        },
        {
            "name": "J\u0119zyk",
            "value": "Polski"
        }
    ]
}';
$apiParams = [
    "token" => "2000797-2001669-PYPJIKOS1IF2PA1K6149MI94WTQD3HBXAI4VLK2PSO1KA3RA7125CR1AIQVCYTHZ", 
    "method" => "addProduct", 
    "parameters" => $methodParams
];

$curl = curl_init("https://api.baselinker.com/connector.php");
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($apiParams));	
$response = curl_exec($curl);

$myJSON = json_decode($response, true); // dodalem to

$id = $myJSON['product_id']; // dodalem to

echo $myJSON; // to tesh


?>