{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api.teller.io/schemas/transaction",
  "title": "Teller Transaction",
  "description": "A financial transaction on a bank account",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Teller transaction identifier"
    },
    "account_id": {
      "type": "string",
      "description": "Account this transaction belongs to"
    },
    "amount": {
      "type": "string",
      "description": "Transaction amount as signed decimal string (negative = debit, positive = credit)",
      "pattern": "^-?[0-9]+(\\.[0-9]+)?$"
    },
    "date": {
      "type": "string",
      "format": "date",
      "description": "ISO 8601 transaction date"
    },
    "description": {
      "type": "string",
      "description": "Bank statement description text"
    },
    "status": {
      "type": "string",
      "enum": ["posted", "pending"],
      "description": "Whether the transaction has settled"
    },
    "type": {
      "type": "string",
      "enum": [
        "card_payment", "transfer", "atm", "deposit", "withdrawal",
        "digital_payment", "wire", "check", "interest", "fee", "other"
      ],
      "description": "Transaction type classification"
    },
    "running_balance": {
      "type": "string",
      "description": "Running account balance after this transaction (posted transactions only)"
    },
    "details": {
      "type": "object",
      "description": "Enriched transaction details",
      "properties": {
        "processing_status": {
          "type": "string",
          "enum": ["pending", "complete"]
        },
        "category": {
          "type": "string",
          "description": "Transaction category (dining, groceries, utilities, travel, etc.)"
        },
        "counterparty": {
          "type": "object",
          "properties": {
            "name": { "type": "string" },
            "type": {
              "type": "string",
              "enum": ["person", "organization"]
            }
          }
        }
      }
    },
    "links": {
      "type": "object",
      "properties": {
        "self": { "type": "string", "format": "uri" },
        "account": { "type": "string", "format": "uri" }
      }
    }
  },
  "required": ["id", "account_id", "amount", "date", "description", "status", "type"]
}