curl -X POST \
  'https://graph.facebook.com/v2.6/me/messenger_profile?access_token=<ACCESS_TOKEN>' \
  -H 'Content-Type: application/json' \
  -d '{
    "get_started": {
        "payload": "{\"block_id\":\"58f3b4fbe4b0216bd39e56d2\",\"blocks\":[\"58f3b4fbe4b0216bd39e56d2\"],\"action\":\"start_action\",\"__button_text__\":\"Get Started\"}"
    }
}'