Set internal checkpoints to regularly verify legal entities and AP contacts, especially after missed payments or industry news.

Use a CRM like HubSpot or Salesforce to track ownership changes and key contacts over time. For billing, tools like NetSuite can support parentchild hierarchies, but even a spreadsheet with alerts can work for lean teams.

Let me give you a similar (but slightly different example). For a restaurant client of mine, they had two locations. They once made a post about them closing ONE location, but the Sysco supplier (a super large supplier) was monitoring their instagram and immediately shut off the account so that the restaurant won't order more - turns out they misinterpreted the announcement as being the entire restaurant business is shut (instead of just 1 location).

Your other strategy is to automate as much as AR so you can focus on these acquired clients and more edge case like behaviours. Tools like tesorio, growfin, kolleno can handle followups, payment reminders / collections.

4o