# Face Authentication

To perform a face authentication it is required to have already an "Identification" and its verification ID. The process consist in a liveness check of the user and a final check to verify the match with the identification.

## Implementation

* Create a `FaceAuthenticationParams` object with authentication information and the verification id you want to verify
* Start the verification with `FaceAuthenticationActivity.startForResult`
* Handle result in `onActivityResult` method

## Example to Start a Face Authentication

Please update the below code with your Client ID and Client Secret from your [Customer Dashboard](https://customer-dashboard.app.authenteq.com/sign-in). 

{% hint style="warning" %}
We suggest to use the token authentication in production environment.
{% endhint %}

{% tabs %}
{% tab title="Java" %}

```java
void faceAuthentication(String verificationId) {
    FaceAuthenticationParams faceAuthenticationParams = new FaceAuthenticationParamsWithClientSecret(
        "< client id >",
        "< client secret >",
        verificationId
        R.style.AuthenteqThemeBase // optional
    );
    FaceAuthenticationActivity.startForResult(
        activity, 
        MY_REQUEST_FACEAUTH_CODE,
        faceAuthenticationParams
    );
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    if (requestCode == MY_REQUEST_FACEAUTH_CODE) {
        if (resultCode == RESULT_OK) {
            String code = FaceAuthenticationActivity.getResult(data);
            // Check face authentication result with the CODE provided
        } else {
            Throwable throwable = FaceAuthenticationActivity.getError(data);
            // Handle error
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
fun faceAuthentication(verificationId: String) {
        val faceAuthenticationParams = FaceAuthenticationParamsWithClientSecret(
                "< client id >",
                "< client secret >",
                verificationId
        )
        FaceAuthenticationActivity.startForResult(
                this,
                MY_REQUEST_FACEAUTH_CODE,
                faceAuthenticationParams
        )
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == MY_REQUEST_FACEAUTH_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                FaceAuthenticationActivity.getResult(data)?.let { code ->
                    // Check face authentication result with the CODE provided
                }
            } else {
                FaceAuthenticationActivity.getError(data)?.let { error ->
                    // Handle error
                }
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data)
        }
}
```

{% endtab %}
{% endtabs %}

Authentication Token can be obtained with face authentication [API](/mo/authentication-token.md#obtain-a-mobile-sdk-temporary-authentication-token-for-face-authentication) and then specified with the `FaceAuthenticationParams` as the following code:

{% tabs %}
{% tab title="Java" %}

```java
void faceAuthentication(String verificationId) {
    FaceAuthenticationParams faceAuthenticationParams = new FaceAuthenticationParamsWithToken(
        "< client id >",
        "< token >",
        verificationId
        R.style.AuthenteqThemeBase // optional
    );
    FaceAuthenticationActivity.startForResult(
        activity, 
        MY_REQUEST_FACEAUTH_CODE,
        faceAuthenticationParams
    );
}
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
fun faceAuthentication(verificationId: String) {
        val faceAuthenticationParams = FaceAuthenticationParamsWithToken(
                "< client id >",
                "< token >",
                verificationId
        )
        FaceAuthenticationActivity.startForResult(
                this,
                MY_REQUEST_FACEAUTH_CODE,
                faceAuthenticationParams
        )
}
```

{% endtab %}
{% endtabs %}

{% hint style="warning" %}
Authentication token can only be used for a single operation. Always generate a new token before start a new face authentication.
{% endhint %}

### Get Face Authentication Result

With the code obtained from `FaceAuthenticationActivity.getResult` it is possible to get the face authentication result using the following API:

## Obtain the result of a face authentication

<mark style="color:blue;">`GET`</mark> `https://api.app.authenteq.com/mobile-sdk/face-authentication-result`

This endpoint is authorized with Basic Authorization. You should use your `Client ID` and `Client Secret` from the Customer Dashboard as the credentials.

#### Query Parameters

| Name                                   | Type   | Description                                                    |
| -------------------------------------- | ------ | -------------------------------------------------------------- |
| code<mark style="color:red;">\*</mark> | string | The code provided at the conclusion of SDK face authentication |

#### Headers

| Name                                            | Type   | Description                                                                                         |
| ----------------------------------------------- | ------ | --------------------------------------------------------------------------------------------------- |
| Authorization<mark style="color:red;">\*</mark> | string | Your client credentials combined with a colon separator, base64-encoded and prefixed with "Basic ". |

{% tabs %}
{% tab title="200 " %}

```
{
  "accessToken": "81e4cbce-cdad-11eb-8fc3-784f4385af2b"
}
```

{% endtab %}

{% tab title="401  Full authentication is required to perform document recognition." %}

```
{
  "errorCode": "API_KEYS_MISSING",
  "errorMessage": "No API Keys in the Authorization header"
```

{% endtab %}

{% tab title="403 The authenticated customer is disabled and cannot get a token." %}

```
{
  "errorCode": "ACCOUNT_DEACTIVATED",
  "errorMessage": "Account deactivated. Please contact your Authenteq Sales Representative in order to keep using this service"
}huiHjio
```

{% endtab %}
{% endtabs %}

When successful the response will contain a single boolean property named `success`:

```json
{
    "success": true
}
```


---

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