curl --request POST \
  --url https://api.sandbox.asapp.com/conversation/v1/conversations/{conversationId}/messages/batch \
  --header 'Content-Type: application/json' \
  --header 'asapp-api-id: <api-key>' \
  --header 'asapp-api-secret: <api-key>' \
  --data '
{
  "messages": [
    {
      "text": "Hello, I would like to upgrade my internet plan to GOLD.",
      "sender": {
        "role": "customer",
        "externalId": "customer-xyz"
      },
      "timestamp": "2021-11-23T12:13:14.555Z"
    },
    {
      "text": "Let me help you with that",
      "sender": {
        "role": "agent",
        "externalId": "agent-111"
      },
      "timestamp": "2021-11-23T12:13:16.666Z"
    }
  ]
}
'

{}