What happens after you connect
YNAB receives transactions through its API using tokens you grant to BudgetSyncer. The bank never sends a password to BudgetSyncer; open banking consent is separate from your YNAB login. Categorization stays in YNAB — BudgetSyncer focuses on reliable import.
Transactions sync automatically on your chosen schedule (default twice per day; you can add or change sync times on the connections page). Exact local times are shown for your timezone. You can also start a manual sync anytime from BudgetSyncer. With Enable Banking there is no separate daily limit on user-triggered syncs (banks may still delay publishing transactions).
BudgetSyncer uses stable bank transaction IDs so pending and booked versions of the same payment do not create two YNAB rows, and on reconnect it skips overlaps that already match date, amount, and payee in YNAB. YNAB also applies its own import ID rules when transactions arrive.

