Request for subscription

{
  "type": "object",
  "required": [
    "requestId",
    "subscription",
    "timestamp"
  ],
  "properties": {
    "requestId": {
      "type": "string",
      "format": "uuid",
      "description": "a nonce, unique for each HTTP request."
    },
    "subscription": {
      "type": "object",
      "required": [
        "categories",
        "hiu",
        "patient",
        "period",
        "purpose"
      ],
      "properties": {
        "categories": {
          "type": "array",
          "items": {
            "type": "string",
            "enum": [
              "LINK"
            ]
          }
        },
        "hips": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "id"
            ],
            "properties": {
              "id": {
                "type": "string"
              }
            }
          }
        },
        "hiu": {
          "type": "object",
          "required": [
            "id"
          ],
          "properties": {
            "id": {
              "type": "string"
            }
          }
        },
        "patient": {
          "type": "object",
          "required": [
            "id"
          ],
          "properties": {
            "id": {
              "type": "string",
              "format": "<user-id>@<ndhm>"
            }
          }
        },
        "period": {
          "type": "object",
          "required": [
            "from",
            "to"
          ],
          "properties": {
            "from": {
              "type": "string",
              "format": "date-time"
            },
            "to": {
              "type": "string",
              "format": "date-time"
            }
          }
        },
        "purpose": {
          "type": "object",
          "required": [
            "code",
            "text"
          ],
          "properties": {
            "code": {
              "type": "string",
              "description": "From the fixed set, documented at refUri"
            },
            "refUri": {
              "type": "string",
              "format": "uri"
            },
            "text": {
              "type": "string"
            }
          }
        }
      }
    },
    "timestamp": {
      "type": "string",
      "format": "date-time",
      "description": "Date time format in UTC, includes miliseconds YYYY-MM-DDThh:mm:ss.vZ"
    }
  }
}