How to cancel order using flipkart seller api - api

Question

Please let me know how I can cancel order through the Flipkart seller API.
I have tried this but it gives me error:
$url = "https://api.flipkart.net/sellers/v2/orders/cancel";
$curl = curl_init();
$json = '{
"orderItems": [
{
"orderItemId": "225561595849261000",
"reason": "not_enough_inventory"
}
]
}';
curl_setopt($curl, CURLOPT_URL,$url);
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $json);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Content-Type:application/json',
'Authorization:Bearer xxxxxxxx',
''
));
$result = curl_exec($curl);
$ee = curl_getinfo($curl);
echo "<pre>";
//print_r($ee);
curl_close($curl);
$result = json_decode($result,true);
print_r($result);
output: Array
(
[errors] => Array
(
[0] => Array
(
[type] => ERROR
[code] => DEPENDENT_SYSTEM_CALL_FAILED
[message] => A call to dependent system failed. Please retry after some time
[params] => Array
(
)
)
)
)
Please help me to cancel order.
Thanks in Advance!!