Fit cheque processing into the systems you already run
Use APIs for account validation, posting and status; controlled files for bank and clearing exchange; and events for audit, analytics and operational monitoring. The integration model follows the destination instead of forcing every system through one brittle interface.
These are integration patterns, not a fixed endpoint or message schema. The item identity, acknowledgements, retry policy, and field mapping are agreed with the bank, clearing, ERP, or treasury system during implementation.