# Biometric auth

![](https://476758574-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVctm8W2AAd8SbIYUaj27%2Fuploads%2FvcjREv4Crg6gmeV2cTo4%2Fimage.png?alt=media\&token=439750e9-d6bb-4445-a481-652b61d9abe1)

{% tabs %}
{% tab title="Entry Vars" %}
**title :** You must enter the title that will be displayed when requesting permissions from the user.

**subtitle :** You must enter the subtitle that will be displayed when requesting permissions from the user.

**description :**  You must enter the description of the use of the function that will be shown when requesting permissions from the user.

**negativeButtonText :** You must enter the description of the use of the function that will be shown when requesting permissions from the user.

**Step by Step :**

<figure><img src="https://476758574-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FVctm8W2AAd8SbIYUaj27%2Fuploads%2FV4LYPIotewcyiuc2YmpV%2FBiometric%20auth.gif?alt=media&#x26;token=8861bdba-2c1e-4a40-a030-727ff76c7d1a" alt=""><figcaption></figcaption></figure>
{% endtab %}

{% tab title="Callbacks & Outvar" %}
**onError :** Runs when access to biometric verification is not allowed or canceled.

OutVars&#x20;

`Null`

**onUnsuccessfulAuth :** It is executed when the biometric data of the user is incorrect to that stored in the device.

OutVars&#x20;

`Null`

**onSuccess :** It is executed when the user's biometric data is correct to that stored in the device.

OutVars&#x20;

`Null`
{% endtab %}

{% tab title="Features" %}

{% endtab %}

{% tab title="examples" %}

{% endtab %}
{% endtabs %}