curl --request POST \
  --url https://api.opal.dev/v1/event-streams \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "webhook_url": "<string>"
}
'

{
  "event_stream_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "connection": {
    "name": "<string>",
    "enabled": true,
    "webhook_url": "<string>",
    "credentials": {
      "api_key_credentials": [
        {
          "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
          "name": "<string>",
          "value": "<string>"
        }
      ],
      "hmac_credential_1": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "secret": "<string>",
        "created_at": "2023-11-07T05:31:56Z"
      },
      "hmac_credential_2": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "secret": "<string>",
        "created_at": "2023-11-07T05:31:56Z"
      }
    }
  }
}