Example testing script for a Facebook Messenger bot running in localhost

send_hello_to_localhost.sh

#!/bin/bash

URL="http://127.0.0.1:8000/api/1.0/bot/webhook"

read -r -d '' MESSAGE_JSON << EOM
{
  "object": "page",
  "entry": [
    {
      "id": <REPLACE_RECIPIENT_ID>,
      "time": 1460998316941,
      "messaging": [
        {
          "sender": {
            "id": <REPLACE_SENDER_ID>
          },
          "recipient": {
            "id": <REPLACE_RECIPIENT_ID>
          },
          "timestamp": 1460998316851,
          "message": {
            "mid": "mid.1460998316839:534effeb2477100249",
            "seq": 25,
            "text": "hi!!!"
          }
        }
      ]
    }
  ]
}
EOM

curl -X POST -H "Content-Type: application/json" -d "$MESSAGE_JSON" "$URL"