Every company that runs sales in a CRM and finance in an accounting package knows the drift. A customer exists twice, spelled slightly differently. The billing address was updated in Attio but not in the administration, so the invoice bounces. Finance drafts an invoice from memory of what was agreed, and sales finds out a customer is overdue only when the relationship has already cooled.
Nance closes that loop. New customers in Attio are created in the administration once, correctly, and kept in sync afterwards. Invoices are drafted with the deal context attached, payment status is written back onto the record, and any divergence between the two systems surfaces as a finding for you to settle. Attio stays the place your team works; the books just stop disagreeing with it.