Chasing Co. starts from the ledger you already keep, and asks for nothing beyond it.
Connecting Xero, MYOB or QuickBooks takes about five minutes. Chasing Co. pulls in every open invoice, credit note, contact and payment term and keeps them in sync. The connection is read-only, so it can see all of that and change none of it. If you later turn write-back on, the only two things it will ever write are a matched payment and a note on a contact.
Then the channels: the mailbox Chasing Co. sends from, an SMS number, and a WhatsApp Business line for the customers who only answer there. All three are yours, in your name, and any of them can be switched off on its own.