curl -i -X POST `
  https://graph.facebook.com/v15.0/101915212852978/messages `
  -H 'Authorization: Bearer EAATkBZBx1GuIBANv5vNb4Mi6gytSUacmZBHHkD6Rg1KcZCZCV3rDkRieWLesfpEAqjvtdVMP8f6wIUCs7P5NgEACzPVTXI1XzTxyj8M5uTozm8n64pcuNdNlDJD9bpnGkZADkvOVNsjNMy9sa3PevVWY6u0QsEgp33mY3VstE64bbh61yGMDcO1HCaWFffBbtvrZBZAUrwKdGvZCZBoEKUmasuC23646xxpsZD' `
  -H 'Content-Type: application/json' `
  -d '{ \"messaging_product\": \"whatsapp\", \"to\": \"919065667606\", \"type\": \"template\", \"template\": { \"name\": \"hello_world\", \"language\": { \"code\": \"en_US\" } } }'