Retrieves the collection of WebhookEndpoint resources.

curl -X GET "/api/webhook_endpoints" \
  -H "apikey: $MEDIALISTER_CLIENT_API_KEY"

{
  "hydra:totalItems": 0,
  "hydra:search": {
    "@type": "string",
    "hydra:template": "string",
    "hydra:variableRepresentation": "string",
    "hydra:mapping": [
      {
        "@type": "string",
        "variable": "string",
        "property": "string",
        "required": true
      }
    ]
  },
  "hydra:member": [
    {
      "@context": "string",
      "@id": "string",
      "@type": "string",
      "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
      "audience": "publisher",
      "url": "https://example.com",
      "enabled": true,
      "verifiedAt": "2026-01-15T09:30:00Z",
      "status": "active",
      "lastDeliveredAt": "2026-01-15T09:30:00Z",
      "lastFailedAt": "2026-01-15T09:30:00Z",
      "lastError": "string",
      "createdAt": "2026-01-15T09:30:00Z",
      "secret": "string"
    }
  ]
}