Order platform and its data stores

{
  "schemaVersion": 1,
  "type": "architecture",
  "title": "Order platform and its data stores",
  "source": "Illustrative reference architecture",
  "width": 1520,
  "height": 560,
  "architecture": {
    "boundaries": [
      {
        "id": "platform",
        "label": "Order platform"
      },
      {
        "id": "data",
        "label": "Data tier",
        "in": "platform"
      }
    ],
    "components": [
      {
        "id": "shopper",
        "label": "Shopper",
        "kind": "person"
      },
      {
        "id": "app",
        "label": "Shop app",
        "kind": "frontend"
      },
      {
        "id": "gateway",
        "label": "API gateway",
        "in": "platform"
      },
      {
        "id": "catalog",
        "label": "Catalog service",
        "in": "platform"
      },
      {
        "id": "orders",
        "label": "Order service",
        "in": "platform"
      },
      {
        "id": "queue",
        "label": "Order events",
        "kind": "queue",
        "in": "platform"
      },
      {
        "id": "billing",
        "label": "Billing worker",
        "in": "platform"
      },
      {
        "id": "catalogDb",
        "label": "Catalog",
        "sublabel": "Postgres",
        "kind": "database",
        "in": "data"
      },
      {
        "id": "ordersDb",
        "label": "Orders",
        "sublabel": "Postgres",
        "kind": "database",
        "in": "data"
      },
      {
        "id": "billingDb",
        "label": "Invoices",
        "sublabel": "Postgres",
        "kind": "database",
        "in": "data"
      }
    ],
    "connections": [
      {
        "from": "shopper",
        "to": "app",
        "label": "orders"
      },
      {
        "from": "app",
        "to": "gateway",
        "technology": "HTTPS"
      },
      {
        "from": "gateway",
        "to": "catalog",
        "label": "browse"
      },
      {
        "from": "gateway",
        "to": "orders",
        "label": "checkout"
      },
      {
        "from": "catalog",
        "to": "catalogDb",
        "technology": "SQL"
      },
      {
        "from": "orders",
        "to": "ordersDb",
        "technology": "SQL"
      },
      {
        "from": "orders",
        "to": "queue",
        "label": "publishes"
      },
      {
        "from": "queue",
        "to": "billing",
        "label": "delivers"
      },
      {
        "from": "billing",
        "to": "billingDb",
        "technology": "SQL"
      }
    ],
    "mainPath": [
      "shopper",
      "app",
      "gateway",
      "orders",
      "queue",
      "billing"
    ],
    "sameRank": [
      [
        "catalogDb",
        "ordersDb",
        "billingDb"
      ]
    ]
  },
  "mobile": {
    "width": 440,
    "height": 1100
  }
}