curl --request GET \
  --url https://api.cleartalk.ai/agency/twilio/a2p-campaign-numbers \
  --header 'x-api-key: <api-key>'

{
  "data": [
    {
      "sid": "<string>",
      "account_sid": "<string>",
      "messaging_service_sid": "<string>",
      "messaging_service_friendly_name": "<string>",
      "brand_registration_sid": "<string>",
      "campaign_id": "<string>",
      "campaign_status": "<string>",
      "opt_in_message": "<string>",
      "opt_out_message": "<string>",
      "help_message": "<string>",
      "opt_in_keywords": [
        "<string>"
      ],
      "opt_out_keywords": [
        "<string>"
      ],
      "help_keywords": [
        "<string>"
      ],
      "date_created": "<string>",
      "date_updated": "<string>",
      "url": "<string>"
    }
  ],
  "meta": {
    "page": 123,
    "pageSize": 123,
    "totalPages": 123,
    "total": 123,
    "start": 123,
    "end": 123
  }
}