# Netcetera

Please specify the payment needs to be externally authenticated via Netcetera by passing the below field in create payments call. You can read more about it [here](https://docs.hyperswitch.io/other-features/merchant-controls/payment-features/3d-secure-3ds/pages/JYdlAKMeo0JbAGXx6Byy#id-1.-create-a-payment-from-your-server-with-request_external_three_ds_authentication-as-true).

```
"request_external_three_ds_authentication": true
```

Pass your Netcetera SDK API key to Hyperswitch SDK like below.

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

<pre class="language-kotlin"><code class="lang-kotlin"><strong>configuration = PaymentSheet.Configuration.Builder("Example, Inc.")
</strong>                .netceteraSDKApiKey("YOUR_NETCETERA_API_KEY")
                .build()
</code></pre>

{% endtab %}

{% tab title="iOS" %}

```swift
configuration.netceteraSDKApiKey="YOUR_NETCETERA_API_KEY"
```

{% endtab %}

{% tab title="Flutter" %}

```dart
configuration: Configuration(netceteraSDKApiKey: "<YOUR_NETCETERA_API_KEY>")
```

{% endtab %}
{% endtabs %}

{% hint style="info" %}
In order to test external authentication on sandbox, a certificate needs to be added. Please follow the below steps.
{% endhint %}

Make the Hyperswitch [Payments - External 3DS Authentication](https://api-reference.hyperswitch.io/v1/payments/payments--external-3ds-authentication) request. Take the value of the field `acs_signed_content`, then decrypt it using [JWT.io](https://jwt.io/). Under the decrypted 'x5c' header you will get your root certificate.

{% hint style="info" %}
This certificate is required to decrypt response from Netcetera's Prev (Sandbox) environment Demo ACS Server.
{% endhint %}

{% hint style="success" %}
Please note the above step is not required for Production environment.
{% endhint %}

### Providing the root certificate to Hyperswitch SDK

#### Android

Put the obtained certificate in assets directory in your android project.

#### iOS

Put the obtained certificate in the root directory in your iOS project.


---

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```
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