{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://noui.bot/specs/mcp-billing-v1/receipt.schema.json",
  "title": "MCP Billing v1 Public Receipt",
  "description": "Legacy stored-receipt response object; public POST verification requires only the seven signed fields plus signature.",
  "type": "object",
  "required": [
    "receipt_id",
    "tool_id",
    "tool_name",
    "agent_id",
    "provider_id",
    "timestamp",
    "duration_ms",
    "cost_microcents",
    "status",
    "signature",
    "created_at"
  ],
  "properties": {
    "receipt_id": {
      "type": "string",
      "pattern": "^rcpt_[0-9a-f]{16,}$"
    },
    "tool_id": {
      "type": "string",
      "minLength": 1
    },
    "tool_name": {
      "type": [
        "string",
        "null"
      ]
    },
    "agent_id": {
      "type": "string",
      "minLength": 1
    },
    "provider_id": {
      "type": "string",
      "minLength": 1
    },
    "timestamp": {
      "type": "string",
      "format": "date-time"
    },
    "duration_ms": {
      "type": [
        "integer",
        "null"
      ],
      "minimum": 0
    },
    "cost_microcents": {
      "type": "integer",
      "minimum": 0
    },
    "status": {
      "type": "string",
      "enum": [
        "success",
        "error",
        "timeout",
        "rate_limited"
      ]
    },
    "signature": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$"
    },
    "created_at": {
      "type": "string",
      "format": "date-time"
    }
  },
  "additionalProperties": false
}