Before automation, establish a single source of identification that all tools can reference confidently. Normalize names, emails, and tax identifiers, and keep a canonical external ID registry. Use deterministic matching where possible and supervised fuzzy rules where necessary. Document merge logic, avoid silent overwrites, and make identity events first-class so downstream systems can react safely, ensuring every invoice, ticket, and conversation points to the correct, enduring customer record.
Treat accounting as the authority for money while allowing upstream systems to suggest intent. Sync invoices, credit memos, payments, and refunds with directionality rules, posting states, and strict idempotency. Preserve currency precision, taxes, and rounding, and surface exceptions when CRM or support propose changes that conflict with ledger logic. Build a reconciliation view that shows exactly what synced, what failed, and why, turning month-end close into a predictable, transparent routine instead of a surprise.
Link tickets and conversations to financial events so humans see context that actually matters. A churn-risk message should travel with the overdue invoice; a warranty dispute should tag the related credit memo. When support resolves a billing error, emit a structured event that can trigger partial refunds, dunning adjustments, or retention sequences. This tight loop speeds resolution, prevents duplicated outreach, and ensures emotionally charged interactions are grounded in the same reliable financial facts.