INE Fingerprint Validation

Incode's INE Fingerprint Validation lets you verify a user's identity against Mexico's Instituto Nacional Electoral (INE) using fingerprint biometrics captured at a branch or kiosk. You supply fingerprint scans from your existing hardware; Incode forwards them to INE for matching and returns a per-finger confidence score alongside the standard government validation result.

This feature must be enabled for your account before use. Contact your Incode representative if you are interested in this feature.

How It Works

Fingerprint validation is a two-step flow:

1. Collection — your app uploads fingerprints to the active session using /omni/add/fingerprints.
2. Validation — your app calls /omni/process/government-validation. Incode selects the best available fingerprints, sends them to INE alongside face and ID data, and returns a combined result.

Fingerprints can also be passed inline in the validation request instead of pre-uploading them. See Sample Request below.

Supported Fingerprint Formats

All formats submitted in a single session must use the same type. If you upload fingerprints with a different type than what is already stored in the session, all previously stored fingerprints are deleted before the new ones are saved.

The most common format in production is WSQ (type: 2).

Finger Index Mapping

Use the index field to identify which finger was scanned.

The most common submission in production is the right index finger (index: 2) in WSQ format.

If a user cannot provide a specific finger, submit whichever finger is available. A single fingerprint is sufficient — there is no minimum beyond one.

API Reference

POST /omni/add/fingerprints

Upload one or more fingerprints to the active session.

Request body:

{
  "type": 2,
  "fingerprints": [
    {
      "index": 2,
      "base64Fingerprint": "<base64-encoded image>",
      "fingerprintMetadata": {
        "device": "scanner_device",
        "resolution": "500x500",
        "qualityScore": "95"
      }
    }
  ]
}

Fields:

Response:

{ "success": true }

Behavior notes:

• The session must be active. Fingerprints cannot be added to a completed or expired session.
• Submitting a fingerprint with the same index as one already stored in the session overwrites the previous one. Use this to replace a low-quality scan.
• You may upload up to 10 fingerprints per session (one per index).

GET /omni/get/fingerprints?interviewId={id}

Retrieve the fingerprints stored for a session. Returns the same structure as the add request, with base64Fingerprint populated from storage.

POST /omni/process/government-validation

Trigger INE identity validation. Incode selects the best available fingerprints from the session and sends them to INE alongside face and ID data.

Fingerprints can be passed inline in this request using the fingerprintsData field, or omitted entirely if they were already uploaded via /omni/add/fingerprints — the service retrieves them from storage automatically. Inline fingerprints take precedence over stored ones.

Finger Selection Logic

INE accepts a maximum of 2 fingerprints per validation request. Incode automatically selects the best available fingerprints from the session before forwarding to INE.

Selection priority:

1. A matched pair (same finger position, both hands) is preferred over a single finger.
2. Pairs are evaluated in this order: Index (2/7) → Thumb (1/6) → Middle (3/8) → Ring (4/9) → Pinky (5/10).
3. If no matched pair is available, the highest-priority single finger is sent.
4. If no fingerprints are available, the request proceeds without fingerprint data.

Sample Request

Full example calling /omni/process/government-validation with fingerprints passed inline:

curl -X POST "https://<host>/omni/process/government-validation?interviewId=<interviewId>" \
  -H "Content-Type: application/json" \
  -H "X-Incode-Hardware-Id: <apiKey>" \
  -H "Authorization: Bearer <token>" \
  -d '{
    "cic": "1234567890",
    "claveElector": "ABCDEF123456789012",
    "nombre": "JUAN",
    "apellidoPaterno": "GARCIA",
    "apellidoMaterno": "LOPEZ",
    "curp": "GALJ800101HDFRCN09",
    "anioRegistro": "2010",
    "anioEmision": "2020",
    "numeroEmisionCredencial": "01",
    "base64Image": "<base64-encoded face template>",
    "fingerprintsData": {
      "type": 2,
      "fingerprints": [
        {
          "index": 2,
          "base64Fingerprint": "<base64-encoded fingerprint image>",
          "fingerprintMetadata": {
            "device": "Suprema BioMini",
            "resolution": "500x500",
            "qualityScore": "92"
          }
        },
        {
          "index": 7,
          "base64Fingerprint": "<base64-encoded fingerprint image>",
          "fingerprintMetadata": {
            "device": "Suprema BioMini",
            "resolution": "500x500",
            "qualityScore": "88"
          }
        }
      ]
    }
  }'

Sample Success Response

{
  "governmentValidationStatus": "OK",
  "governmentRecognitionConfidence": 97.3,
  "governmentRecognitionConfidence2": 95.1,
  "governmentFingerprintConfidence": {
    "finger1": null,
    "finger2": 98.5,
    "finger3": null,
    "finger4": null,
    "finger5": null,
    "finger6": null,
    "finger7": 96.2,
    "finger8": null,
    "finger9": null,
    "finger10": null
  },
  "comparisonResults": {
    "nombre": true,
    "apellidoPaterno": true,
    "apellidoMaterno": true,
    "claveElector": true,
    "curp": true,
    "ocr": true,
    "anioRegistro": true,
    "anioEmision": true,
    "numeroEmisionCredencial": true
  },
  "registralSituation": {
    "tipoSituacionRegistral": "VIGENTE",
    "tipoReporteRoboExtravio": null
  }
}

null values for fingers not submitted are expected. INE only scores the fingers it received.

Response Fields

Fingerprint Confidence

governmentFingerprintConfidence contains per-finger similarity scores returned by INE. Scores range from 0–100. Only fingers included in the request will have non-null values.

Face Confidence

Comparison Results

INE validates whether the data on the ID card matches its records. Each field returns true or false.

Registral Situation

INE returns the current status of the credential.

tipoSituacionRegistral:

tipoReporteRoboExtravio:

Status Codes

Dashboard

When fingerprint validation is enabled, the Gov Verification section in the single session view displays:

• Fingerprint images for each finger submitted
• Which finger was captured (index 1–10)
• Individual confidence score per finger
• Pass/fail status per finger
• Overall verification result
• Device metadata
• Timestamp and INE response details

Only fingers that were actually submitted appear in the dashboard — all 10 slots are not shown by default.