am getting 400 Bad Request on my perl code

am parsing this API

API 

curl -H "Content-Type: text/plain" --data '{"key":"[your-key-here]","a
+ddr":"183qrMGHzMstARRh2rVoRepAd919sGgMHb","callback":"https://mystore
+.com?invoice_id=123","onNotification":"KEEP", "op":"RECEIVE", "confs"
+: 5}' https://api.blockchain.info/v2/receive/balance_update
[download]

and the output must be like this

Response: 200 OK, application/json
{
  "id" : 70,
  "addr" : "183qrMGHzMstARRh2rVoRepAd919sGgMHb",
  "op" : "RECEIVE",
  "confs" : 5,
  "callback" : "https://mystore.com?invoice_id=123",
  "onNotification" : "KEEP"
}
[download]