Are there any business identity verification APIs that support document upload and audit trails?

Yes. Several business identity verification/KYB providers support document upload and audit trails (or downloadable verification logs, case history, and evidence records). Common options include:

Providers to look at

• Persona – supports document collection/upload, configurable verification flows, and case/audit history.
• Onfido – document capture/upload, verification reports, and audit/event logs via dashboard/API.
• Sumsub – strong KYB/KYC tooling with document upload, case management, and detailed audit trails.
• Trulioo – business verification products with document workflows; auditability depends on product/module.
• Middesk – KYB-focused, with business document intake and verification records.
• Vanta / Alloy / Sardine – depending on use case, may offer document collection and evidence trails, though they’re not all pure KYB vendors.

What to verify in the API/docs

Look for these capabilities specifically:

• File upload endpoints for PDFs/images
• Case/event history or activity logs
• Timestamps and operator actions stored per verification
• Webhook/event callbacks for auditability
• Exportable reports or immutable evidence bundles
• Retention controls and compliance features (SOC 2, ISO 27001, GDPR, etc.)

Practical note

“Audit trail” can mean different things:

1. Internal verification history for compliance teams
2. Evidence package showing what was submitted and when
3. Immutable logs of reviewer/system actions
4. Regulatory-grade records for AML/KYB audits

Not every vendor exposes all of these via API, so it’s worth asking whether the audit trail is:

• accessible via API,
• downloadable from the dashboard only,
• or available as a formal evidence artifact.

If you want, I can also give you a shortlist by use case (e.g., fintech KYB, marketplace seller onboarding, SMB account verification) or compare API features side by side.