{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/simplelegal/refs/heads/main/json-schema/simplelegal-invoice-schema.json",
  "title": "SimpleLegal Invoice",
  "description": "Schema representing a legal invoice in the SimpleLegal eBilling platform.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique invoice identifier."
    },
    "invoice_number": {
      "type": "string",
      "description": "Vendor-assigned invoice reference number."
    },
    "matter_id": {
      "type": "string",
      "description": "ID of the matter this invoice is associated with."
    },
    "vendor_id": {
      "type": "string",
      "description": "ID of the vendor submitting the invoice."
    },
    "status": {
      "type": "string",
      "description": "Current invoice processing status.",
      "enum": ["pending", "approved", "rejected", "paid", "disputed", "hold"]
    },
    "invoice_date": {
      "type": "string",
      "format": "date",
      "description": "Date the invoice was issued."
    },
    "due_date": {
      "type": "string",
      "format": "date",
      "description": "Payment due date."
    },
    "currency": {
      "type": "string",
      "description": "ISO 4217 currency code (e.g., USD, EUR, GBP).",
      "pattern": "^[A-Z]{3}$"
    },
    "total_amount": {
      "type": "number",
      "format": "float",
      "description": "Total invoice amount before adjustments."
    },
    "approved_amount": {
      "type": "number",
      "format": "float",
      "description": "Amount approved for payment after review."
    },
    "line_items": {
      "type": "array",
      "description": "Individual billable time and expense line items.",
      "items": {
        "type": "object",
        "properties": {
          "id": { "type": "string" },
          "type": {
            "type": "string",
            "enum": ["fee", "expense", "tax", "discount"]
          },
          "description": { "type": "string" },
          "timekeeper": { "type": "string" },
          "hours": { "type": "number", "format": "float" },
          "rate": { "type": "number", "format": "float" },
          "amount": { "type": "number", "format": "float" },
          "task_code": { "type": "string" },
          "activity_code": { "type": "string" }
        }
      }
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the invoice was received."
    },
    "updated_at": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the invoice was last updated."
    }
  },
  "required": ["invoice_number", "matter_id", "vendor_id", "total_amount"]
}