<?php
 
$file_path = "a.json";
$real_path = realpath($file_path);

$url = "https://mpop-sit.hepsiburada.com/product/api/products/import";
 
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 
$headers = array(
   "Accept: application/json",
   "Content-Type: multipart/form-data",
   "Authorization: Bearer {TOKENİM}",
);
	
$fields_for_file = [
				'filename' => new CurlFile($real_path, mime_content_type($real_path), basename($real_path))

			];
			
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
 
curl_setopt($curl, CURLOPT_POSTFIELDS, $fields_for_file); 


curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 
$resp = curl_exec($curl);
curl_close($curl);
var_dump($resp);
 
?>
Bu şekilde dener misiniz