For bookkeeping & accounting firms
CallbackProof turns "call the vendor back on a known number" from an ad-hoc habit into an enforced checklist with a tamper-evident audit log — across every client your firm manages. When an insurer or auditor asks for your callback procedure, you hand them the record.
No card required. Set up your first client in minutes.
"Our bank details changed — please update before the next payment." Your team fields these every week, for dozens of clients. Most are real. The procedure has to be the same either way.
Call the vendor back on a number you already had on file — never one from the request — and have a second person sign off. The hard part isn't knowing this. It's doing it consistently and proving you did.
Cyber-insurance applications and auditors increasingly ask for a documented callback procedure. Scattered emails and sticky notes aren't a record. CallbackProof is.
A case can only reach Verified by completing every step. The order is enforced, and every action lands in an append-only, hash-chained log with server-side timestamps.
A change request comes in — by email, phone, or your client’s intake link. Record what changed, who asked, and the last 4 digits of the new account. Never the full number.
Pull the vendor’s phone number from your own records — the vendor file, a prior invoice, the official website. Never from the change request itself. Record where it came from.
Call the vendor on that independent number. Log who called, the number dialed, who answered, and whether they confirmed the change.
A second firm user reviews the case and approves. Solo practice? An explicit solo override is allowed — and permanently recorded as such.
Give each client a shareable form. Their staff submit change requests in a structured way — no logins, rate-limited — and each submission opens a draft case for your review.
Every case action is appended to a SHA-256 hash-chained log with server-side timestamps. No edits, no deletions — corrections are new entries. Integrity is checkable at any time.
The callback can’t be logged before an independent contact is recorded. Approval can’t happen before the callback. The checklist is the workflow.
Open cases, overdue verifications, and per-client counts in one place. Email notifications when a case is assigned, awaiting second approval, or arrives via intake.
One click: all cases for a client or date range as a PDF pack plus CSV — exactly what you hand over when asked for your documented procedure.
CallbackProof stores only the last 4 digits of any account number, ever. Evidence files live in a private bucket and are shared only via expiring signed links.
14-day free trial on both plans. No card required to start.
$99/mo
$199/mo
One misdirected vendor payment typically costs more than a decade of CallbackProof. Billing is handled by Lemon Squeezy (merchant of record); cancel anytime.
CallbackProof is a documentation and workflow tool. It enforces your verification checklist and produces a defensible record of the steps your firm performed. It does not validate bank-account ownership, does not screen or block payments, and is not a fraud-prevention service or guarantee. Judgment about whether to act on a change request always remains with your firm.