{
  "name": "USAA Bank Account",
  "description": "Structure of USAA account data accessible via open banking aggregators",
  "fields": [
    {"name": "accountId", "type": "string", "required": true, "description": "Unique account identifier from aggregator"},
    {"name": "accountType", "type": "string", "required": true, "description": "checking, savings, credit, loan, investment, insurance"},
    {"name": "accountSubtype", "type": "string", "required": false, "description": "More specific account type"},
    {"name": "institutionName", "type": "string", "required": true, "description": "USAA Federal Savings Bank"},
    {"name": "mask", "type": "string", "required": false, "description": "Last 4 digits of account number"},
    {"name": "name", "type": "string", "required": false, "description": "Account display name"},
    {"name": "balances", "type": "AccountBalances", "required": false, "description": "Balance information"},
    {"name": "currency", "type": "string", "required": false, "description": "ISO 4217 currency code"}
  ],
  "nested": {
    "AccountBalances": [
      {"name": "available", "type": "number|null"},
      {"name": "current", "type": "number|null"},
      {"name": "limit", "type": "number|null"},
      {"name": "currencyCode", "type": "string"}
    ]
  }
}