Accounting data is part of a wider workflow that can include orders, customers, stock, invoices, and payments. Before connecting systems, decide which system owns each record and when information is allowed to move between them.
A reliable integration also needs failure handling. Log rejected records, make retries safe, show staff what needs attention, and avoid silently creating duplicates. The best design is understandable to the people who operate it every day.
Before development or a major change, turn this idea into a clear operating agreement: define the people who use the process, the records that must remain trustworthy, the approval boundaries, and the result the business will review. A small pilot with real examples can reveal missing rules earlier than a large build and make later support, handover, and integration safer.