curl --request DELETE \
  --url https://api-m.sandbox.paypal.com/v1/commerce/billing/subscriptions/{external_subscription_id}/alerts/{alert_code} \
  --header 'Authorization: Bearer <token>'

{
  "status": "204 No Content",
  "headers": {
    "paypal-debug-id": "f772b19c-c5c2-426d-8871-346a6cd094c5"
  }
}

{
  "name": "<string>",
  "debug_id": "<string>",
  "message": "<string>",
  "details": [
    {
      "field": "<string>",
      "value": "<string>",
      "location": "<string>",
      "issue": "<string>",
      "description": "<string>"
    }
  ]
}

{
  "name": "UNPROCESSABLE_ENTITY",
  "message": "The requested action could not be performed, semantically incorrect, or failed business validation.",
  "debug_id": "90957fca61718",
  "details": [
    {
      "field": "/email",
      "value": "sdfwdj@sdfs.com",
      "location": "body",
      "issue": "UNSUPPORTED_EMAIL",
      "description": "The email provided is not supported."
    }
  ]
}

{
  "name": "INTERNAL_SERVER_ERROR",
  "message": "An internal server error has occurred.",
  "debug_id": "90957fca61718"
}