Import JSON

Hi,

I do understand that my question is out of the scope of this support and I apologize in advance.

My first question is if I can import JSON files. As I read on your website the answer is yes.

My second and most important question is:

A vendor I am working with, has a magento based store.
He is providing me with API (for fetching and updating products).
I want to print the JSON file.
The vendor provided me with a php sample file and asked me to use it.
Unfortunately I am not familiar with this and I need help.
So the task is to create a php file that will print the JSON.
Then upload the file on my server and use it as a URL in order to import and update products.

This is the content of the php sample file:

<?php

$base_url = 'https://www.inart.com/';
$gr_url   = $base_url . 'api/rest/products/store/1';   //Products in Greek language
$en_url   = $base_url . 'api/rest/products/store/2';   //Products in English Language

$consumer_key    = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX';
$consumer_secret = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX';
$token           = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX';
$token_secret    = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX';

$parameters = array();

$headers    = array(
    'Content-Type' => 'application/json',
    'Accept'       => 'application/json'
);

$filters    = array(
    //Number of products per page (Default 10, Max 100)
    'limit' => 20,
    //Number of page to fetch
    'page'  => 1
); 
//For more filters visit: http://devdocs.magento.com/guides/m1x/api/rest/get_filters.html

$url = $gr_url . '?' . http_build_query($filters);

try {
    $oauthClient = new OAuth($consumer_key, $consumer_secret, OAUTH_SIG_METHOD_HMACSHA1, OAUTH_AUTH_TYPE_AUTHORIZATION);

    $oauthClient->setToken($token, $token_secret);

    $oauthClient->fetch($url, $parameters, OAUTH_HTTP_METHOD_GET, $headers);

    $json = $oauthClient->getLastResponse();

    echo $json;
} catch (Exception $e) {
    echo $e->getMessage();
}

Can you please help me with that?
Or at least point me to the right direction…

Thank you!