{
  "type": "object",
  "description": "Internal payment request tracking (extends with Seren-specific fields)",
  "required": [
    "payment_request_id",
    "publisher_id",
    "expires"
  ],
  "properties": {
    "eip712TypedData": {
      "oneOf": [
        {
          "type": "null"
        },
        {
          "$ref": "#/components/schemas/Eip712TypedData",
          "description": "EIP-712 typed data for signing (EIP-3009 only)"
        }
      ]
    },
    "estimate": {
      "oneOf": [
        {
          "type": "null"
        },
        {
          "$ref": "#/components/schemas/CostEstimate",
          "description": "Optional: Estimated cost breakdown"
        }
      ]
    },
    "expires": {
      "type": "integer",
      "format": "int64",
      "description": "Expiration timestamp (Unix seconds)"
    },
    "payment_request_id": {
      "type": "string",
      "description": "Payment request ID for correlation"
    },
    "publisher_id": {
      "type": "string",
      "format": "uuid",
      "description": "Publisher ID"
    }
  }
}