> ## Documentation Index > Fetch the complete documentation index at: https://docs.go.gbgplc.com/llms.txt > Use this file to discover all available pages before exploring further. # Biometrics Reverification > Reverify a returning person in GBG GO by confirming a live, uninjected selfie and matching it against a previously captured anchor image. The **Biometrics Reverification** module verifies the authenticity and liveness of a person's image. It then matches that image against a trusted source image. The module combines three checks into a single overall result: * IAD (injection attack detection) capture liveness * Face liveness * Face match Use this module for reverification scenarios. It confirms that the person presenting themselves is the same individual verified during an earlier onboarding or identity check. The module requires a new encrypted selfie and a previously captured anchor image to compare against. Required inputs include encrypted selfie and anchor image. ## Capabilities The module returns four capabilities: an overall result and the individual result of each underlying check. ### Overall result This capability returns the combined outcome of all reverification checks. | Code | Label | Description | | -------- | ------ | -------------------------------------------------------------------------------------------------- | | `Passed` | Passed | All reverification checks passed. The selfie is live, not injected, and matches the anchor image. | | `Failed` | Failed | One or more reverification checks failed. | | `Error` | Error | The overall result could not be determined due to a system-level issue. This is the default value. | ### IAD: Capture liveness This capability indicates whether the captured image passes injection attack detection. It confirms the selfie was taken live rather than injected from a pre-recorded or synthetic source. | Code | Label | Description | | ---------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------- | | `Live` | Live | The selfie was captured live through a legitimate device camera. | | `Not Live` | Not Live | An injection attack was detected. The selfie appears to have been injected from a pre-recorded or synthetic source rather than captured live. | | `Error` | Error | The injection attack detection check could not be completed due to a technical issue. This is the default value. | ### Face liveness This capability indicates whether the face in the selfie is a live person rather than a photo, mask, or deepfake. | Code | Label | Description | | ---------- | -------- | ------------------------------------------------------------------------------------------------------------------- | | `Live` | Live | The face is live. A real, physically present person was in front of the camera when the selfie was captured. | | `Not Live` | Not Live | The face is not live. The selfie may be a printed photograph, screen replay, video recording, 3D mask, or deepfake. | | `Error` | Error | The face liveness check could not be completed due to a technical issue. This is the default value. | ### Face match This capability indicates whether the face in the selfie matches the anchor image. | Code | Label | Description | | ---------- | -------- | ------------------------------------------------------------------------------------------------ | | `Match` | Match | The face in the selfie matches the anchor image. | | `No Match` | No Match | The face in the selfie does not match the anchor image. | | `Error` | Error | The face match check could not be completed due to a technical issue. This is the default value. | ## Default outcomes The outcome logic uses only the overall result. The individual check capabilities are available for custom evaluation rules but are not used in the default outcomes. | Outcome | Condition | Description | | --------- | ------------------------------- | ------------------------------------------------------------------------------------------------- | | `Success` | Overall result is `Passed` | All reverification checks passed. The selfie is live, not injected, and matches the anchor image. | | `Failed` | Overall result is `Failed` | One or more reverification checks failed. | | `ERROR` | Default (no conditions matched) | An unexpected error occurred during processing. | ## Input payload The module requires an `EncryptedSelfie` input with `selfieImageEncryption` set to `true`, along with an `AnchorImage` input to compare against. The anchor image must be prefilled at journey start. The following is a sample payload used to submit an encrypted selfie and anchor image to the **Biometrics Reverification** module for processing. ```json JSON theme={null} { "resourceId": "", "context": { "config": { "delivery": "api" }, "subject": { "biometrics": [ { "selfieImageEncryption": true, "selfieImage": "", "anchorImage": "" } ] } } } ``` | Field | Required | Description | | ----------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | `selfieImageEncryption` | Yes | Must be set to `true` to indicate the selfie image has been encrypted for injection attack detection. | | `selfieImage` | Yes | Base64-encoded encrypted selfie image captured from the end user. | | `anchorImage` | Yes | Base64-encoded reference image used for comparison. This is the previously captured image from the subject's earlier onboarding or identity check, and must be prefilled at journey start. | ## Sample response The following is a sample response from the **Biometrics Reverification** module. In this example the selfie is live and not injected, but does not match the anchor image, so the overall result is `Failed`. ```json JSON theme={null} { "response": { "advice": { "contains": { "iadCaptureLiveness": "Live", "faceLiveness": "Live", "faceMatch": "No Match", "overallResult": "Failed" } }, "outcome": "Failed" } } ``` ### Biometrics Reverification ## Capabilities ### Face match Face match result. | Value | Description | | ---------- | ------------------ | | `Match` | Face matched | | `No Match` | Face did not match | | `Error` | Face match error | ### Face liveness Face liveness result. | Value | Description | | ---------- | ------------------- | | `Live` | Face is live | | `Not Live` | Face is not live | | `Error` | Face liveness error | ### IAD: capture liveness IAD capture liveness result. | Value | Description | | ---------- | -------------------- | | `Live` | Capture is live | | `Not Live` | Capture is not live | | `Error` | Liveness check error | ### Overall result Final outcome of the reverification process. | Value | Description | | -------- | --------------------- | | `Passed` | Reverification passed | | `Failed` | Reverification failed | | `Error` | Reverification error | ### Biometrics Onboarding ## Capabilities ### Face match Face match result. | Value | Description | | ---------- | ------------------ | | `Match` | Face matched | | `No Match` | Face did not match | | `Error` | Face match error | ### Face liveness Face liveness result. | Value | Description | | ---------- | ------------------- | | `Live` | Face is live | | `Not Live` | Face is not live | | `Error` | Face liveness error | ### IAD: capture liveness IAD capture liveness result. | Value | Description | | ---------- | -------------------- | | `Live` | Capture is live | | `Not Live` | Capture is not live | | `Error` | Liveness check error | ### Overall result Final outcome of the onboarding process. | Value | Description | | -------- | ----------------- | | `Passed` | Onboarding passed | | `Failed` | Onboarding failed | | `Error` | Onboarding error |