SYNTHETIC PROOF WALKTHROUGH

Flag a tax-form packet with no supplied signature date

A synthetic W-9 completeness result using the final four identifier digits only and no full tax identifier.

See the three stepsRead the product contract →
NO KEY · NO UPLOAD · NO CUSTOMER DATAThis demonstration runs entirely in your browser using the visible synthetic fixture below.

THREE STEPS

Put the control before the consequential action.

The supplied W-9 fields include a legal name and final four digits but no signature date.

  1. 01

    Send minimum structured evidence

    The caller supplies form type, legal name, final four digits, dates, and country without sending a full tax identifier.

  2. 02

    Check field completeness

    The control evaluates required presence, supplied expiry, and obvious form-country inconsistency.

  3. 03

    Route for customer review

    Missing signature evidence produces a narrow exception rather than a tax-validity claim.

VISIBLE SYNTHETIC CONTRACT

Inspect exactly what the workflow sees.

The input and output are representative of the named product contract. Copy them into an architecture note, test fixture, or internal review—never treat this browser-only demonstration as a live control result.

Customer-authorized input
{
  "form_type": "W9",
  "legal_name": "Northstar Supply LLC",
  "tax_identifier_last4": "1042",
  "entity_country": "US"
}
Agent-readable output
{
  "status": "COMPLETED",
  "decision": "REVIEW_REQUIRED",
  "exceptions": [
    {
      "code": "TAX_FORM_SIGNATURE_DATE_MISSING",
      "severity": "HIGH",
      "message": "The tax form has no supplied signature date.",
      "evidence": {}
    }
  ],
  "evidence": {
    "form_type": "W9",
    "has_legal_name": true,
    "has_identifier_last4": true,
    "signed_on": null
  },
  "next_action": "Collect the signed form before relying on it."
}

WHAT THIS PROVES

Evidence for a stop point—not permission to act.

This is a completeness check only. It does not verify a TIN, determine tax status, validate a signature, or provide tax advice.

Decision
REVIEW_REQUIRED
Named exception
TAX_FORM_SIGNATURE_DATE_MISSING
Evidence
form typeW9has legal nametruehas identifier last4truesigned onnull
Next action
Collect the signed form before relying on it.

KEEP BUILDING

Move from the synthetic fixture to the exact API contract.

Review the product inputs, outputs, errors, and safety boundary before using authorized data. The related implementation guide explains the design decisions behind the control.

Product contract →Implementation guide →Security posture →

Try the control through the supported buyer path.

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