Build an intraday balance polling loop to maintain a live cash position across multiple bank accounts for treasury operations

Steps

1. Enumerate all bank accounts requiring intraday monitoring and store their internal identifiers; for each account, determine the bank's reporting mechanism — some banks offer real-time balance API endpoints, others deliver intraday BAI2 files via SFTP on a schedule (e.g., every 30-60 minutes), and others provide camt.052 intraday statements
2. Implement a polling loop that, for each account, calls the balance endpoint or retrieves the latest intraday file at the bank's stated refresh frequency; do not poll faster than the bank's update cadence as this returns stale data and may trigger rate-limit responses
3. Build a cash position model that combines: the prior-day closing ledger balance (from the overnight BAI2 or camt.053), plus intraday credits received (incoming wires, ACH settlements, lockbox credits), minus intraday debits posted (outgoing wires, ACH debits, fees), to produce a running available balance per account
4. Tag each balance observation with the as-of timestamp from the bank's response rather than the polling timestamp, since bank balance refreshes are batch cycles and the observed balance may be minutes old even when just retrieved
5. Aggregate individual account positions into a consolidated treasury position view; apply funding rules (e.g., if account A falls below threshold X, initiate a transfer from account B) based on the consolidated position rather than per-account balances in isolation
6. Alert on position anomalies: flag any account where the intraday available balance drops below the configured minimum operating buffer, and flag any account where intraday debits exceed the opening balance by more than an expected variance threshold