/cases/{case_id}/bank-accounts/{account_id}
  /signers          - Account holders and authorized signers
  /transactions     - Transaction history
  /recurring-payments - Autopay, subscriptions, direct deposits
  /beneficiaries    - POD/TOD beneficiary designations
  /statements       - Bank statement uploads
  /balance-history  - Historical balance snapshots

curl -X POST "https://api.example.com/v1/cases/{case_id}/bank-accounts" \
  -H "Content-Type: application/json" \
  -d '{
    "institution_name": "Chase Bank",
    "account_type": "checking",
    "account_number": "123456789",
    "ownership_type": "individual",
    "status": "open",
    "current_balance": 15230.50
  }'

curl -X POST ".../bank-accounts/{account_id}/signers" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "John Jonas Johnson",
    "role": "primary_holder",
    "is_deceased": true
  }'

curl -X POST ".../bank-accounts/{account_id}/beneficiaries" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "John Jonas Johnson",
    "relationship": "son",
    "percentage_share": 100.0,
    "designation_type": "pod",
    "is_contingent": false
  }'

curl -X POST ".../bank-accounts/{account_id}/recurring-payments" \
  -H "Content-Type: application/json" \
  -d '{
    "payee_name": "Springfield Electric Co.",
    "type": "utility",
    "amount": 150.00,
    "frequency": "monthly",
    "status": "active"
  }'

curl -X POST ".../bank-accounts/{account_id}/transactions" \
  -H "Content-Type: application/json" \
  -d '{
    "date": "2025-10-15",
    "type": "estate_distribution",
    "amount": -25000.00,
    "description": "Distribution to beneficiary - John Johnson",
    "category": "beneficiary_distribution"
  }'

curl -X POST ".../bank-accounts/{account_id}/statements" \
  -F "file=@statement_oct_2025.pdf" \
  -F "period_start=2025-10-01" \
  -F "period_end=2025-10-31" \
  -F "opening_balance=15230.50" \
  -F "closing_balance=12450.00"

curl -X PATCH ".../transactions/{transaction_id}" \
  -H "Content-Type: application/json" \
  -d '{
    "is_flagged": true,
    "flag_reason": "estate_related",
    "notes": "Large withdrawal 2 weeks before death - needs review"
  }'