> For the complete documentation index, see [llms.txt](https://docs.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.verifone.com/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/slim_integrated_host.md).

# Slim-Integrated Host Transactions

Integrated host transactions allow a client of the sdk to handle the communication between the card reader and the host which approves the transaction.

You are required to implement the Payment Sdk apis for initialization, performing a sale and handling the required [CommerceListenerAdapter](https://app.gitbook.com/s/yzyMJNwlQJZoQOIC8vZ8/api/moduleindex-4/_commerce_listener_adapter_8java) events.

## Payment Sdk initialization for Slim-Integrated

To use this feature you need to set DEVICE\_HOST\_AUTHENTICATION\_KEY to DEVICE\_HOST\_AUTHENTICATION\_ENABLED when initializing the SDK. Please see [Connection to Payment Applicati](/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/pos_guide.md#connection-to-payment-application) for a complete description of the initialization process.

{% tabs fullWidth="false" %}
{% tab title="Java" %}
{% code lineNumbers="true" fullWidth="true" %}

```java
HashMap<String, String> paramMap = new HashMap<>();
paramMap.put(TransactionManager.DEVICE_HOST_AUTHENTICATION_KEY,
    TransactionManager.DEVICE_HOST_AUTHENTICATION_ENABLED);
mPaymentSdk.initializeFromValues(mInitStatusListener, paramMap);
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code lineNumbers="true" %}

```kotlin
 val paramMap = HashMap()
paramMap.put(TransactionManager.DEVICE_HOST_AUTHENTICATION_KEY, TransactionManager.DEVICE_HOST_AUTHENTICATION_ENABLED)
mPaymentSdk.initializeFromValues(mInitStatusListener, paramMap)
```

{% endcode %}
{% endtab %}

{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
let paramMap = [
    VFITransactionManagerDEVICEHOSTAUTHENTICATIONKEY:
    VFITransactionManagerDEVICEHOSTAUTHENTICATIONENABLED]
sdk.initialize(fromValues: self, config: paramMap)
```

{% endcode %}
{% endtab %}

{% tab title="C#" %}

<pre class="language-csharp" data-line-numbers data-full-width="true"><code class="lang-csharp"><strong> var param_map = new Windows.Foundation.Collections.StringMap
</strong>{
    {TransactionManager.DEVICE_HOST_AUTHENTICATION_KEY,
    TransactionManager::DEVICE_HOST_AUTHENTICATION_ENABLED}
};
payment_sdk_.InitializeFromValues(param_map);
</code></pre>

{% endtab %}

{% tab title="C++" %}
{% code lineNumbers="true" %}

```cpp
std::unordered_map<std::string, std::string> param_map;
// Add other required parameters:
param_map.insert({verifone_sdk::TransactionManager::DEVICE_HOST_AUTHENTICATION_KEY,
    verifone_sdk::TransactionManager::DEVICE_HOST_AUTHENTICATION_ENABLED});
payment_sdk_->initializeFromValues(listener, param_map);
```

{% endcode %}
{% endtab %}

{% tab title=".NET" %}
{% code lineNumbers="true" %}

```aspnet
var param_map = new Dictionary<string, string>
{
    {TransactionManager.DEVICE_HOST_AUTHENTICATION_KEY,
    TransactionManager::DEVICE_HOST_AUTHENTICATION_ENABLED}
};
payment_sdk_.InitializeFromValues(param_map);
```

{% endcode %}
{% endtab %}
{% endtabs %}

{% hint style="info" %}
**See also**

* [Connection to Payment Application](/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/pos_guide.md#connection-to-payment-application)
* [login-logout](/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/pos_guide.md#id6)
* [start-session](/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/pos_guide.md#session)
* [performing-a-sale](/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/payment_functions/semi-integrated-payments/performing-a-sale.md)
  {% endhint %}

## Host Authorization Event

During a transaction in which the payment application requires host authorization, the payment application sends a [HostAuthorizationEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostauthorizationevent) to the [CommerceListenerAdapter](https://app.gitbook.com/s/yzyMJNwlQJZoQOIC8vZ8/api/moduleindex-4/_commerce_listener_adapter_8java) which was previously created.

When you receive the [HostAuthorizationEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostauthorizationevent) it will contain information about the payment that you as the client will be required to send to your host for authorization. Once you have a response from your host you must then forward the details back to the PSDK using the [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal). The response must contain the auth code, host decision, and any EMV data supplied by your host response.

If you receive a [HostAuthorizationEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostauthorizationevent) then you must provide a response through [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal).

This event has apis for getting the [HostPaymentContext](https://docs.verifone.com/psdk-api-latest/android-java/index/hostpaymentcontext), [HostPaymentData](https://docs.verifone.com/psdk-api-latest/android-java/index/hostpaymentdata), [HostTransaction](https://docs.verifone.com/psdk-api-latest/android-java/index/hosttransaction), and [HostSalesData](https://docs.verifone.com/psdk-api-latest/android-java/index/hostsalesdata).

{% tabs fullWidth="false" %}
{% tab title="Java" %}
{% code lineNumbers="true" fullWidth="true" %}

```java
@Override // Overridden from the CommerceListenerAdapter
public void handleHostAuthorizationEvent(HostAuthorizationEvent event) {
   if (event.getStatus() == StatusCode.SUCCESS) {
        // use event data to communicate with the host
        HostTransaction hostTransaction = event.getHostTransaction();
        BigDecimal authAmount = ConversionUtility.parseAmount(0.00);
        if (hostTransaction != null && hostTransaction.getTotalAmount() != null) {
            authAmount = ConversionUtility.parseAmount(hostTransaction.getTotalAmount());
        }
        HashMap<String, String> emvData = new HashMap<>();
        emvData.put("8a", "abc123");
        emvData.put("91", "cba312");
        emvData.put("92", "bac213");
        transactionManager.respondToHostAuthorization(
            "123456",
            HostDecisionType.HOST_AUTHORIZED,
            emvData,
            Decimal.valueOf(authAmount);
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code lineNumbers="true" %}

```kotlin
 // Overridden from the CommerceListenerAdapter
@Override fun handleHostAuthorizationEvent(event: HostAuthorizationEvent) {
   if (event.getStatus() == StatusCode.SUCCESS) {
        // use event data to communicate with the host
        val hostTransaction = event.getHostTransaction()
        var authAmount = ConversionUtility.parseAmount(0.00)
        if (hostTransaction != null && hostTransaction.getTotalAmount() != null) {
            authAmount = ConversionUtility.parseAmount(hostTransaction.getTotalAmount())
        }
        val emvData = mutableMapOf("8a" to "abc123",
            "91" to "cba312",
            "92" to "bac213")
        transactionManager.respondToHostAuthorization(
            "123456",
            HostDecisionType.HOST_AUTHORIZED,
            emvData,
            Decimal.valueOf(authAmount))
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
// Overridden from the VFICommerceListenerAdapter
override func handle(_ event: VFIHostAuthorizationEvent?) {
    if (event?.getStatus() == VFIStatusCodeSuccess) {
        // use event data to communicate with the host
        let emvData = ["8a": "abc123", "91": "cba312", "92": "bac213"]
        var amount = VFIDecimal.init(valueDecimal: Decimal.init(0.00))
        if let total = event?.getHostTransaction()?.totalAmount {
            amount = VFIDecimal.init(valueDecimal: Decimal.init(string: total) ?? 0.0)
        }
        sdk?.getTransactionManager()?.respond(
            toHostAuthorization: "123456",
            hostDecision: VFIHostDecisionTypeHOSTAUTHORIZED,
            emvTags: emvData,
            authAmount: amount)
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="C#" %}

<pre class="language-csharp" data-line-numbers data-full-width="true"><code class="lang-csharp"><strong> private readonly EventHandler&#x3C;HostAuthorizationEvent> host_authorization_event_handler;
</strong>
private void HandleEvent(HostAuthorizationEvent event)
{
    if (event.Status == StatusCode.SUCCESS)
    {
        // use event data to communicate with the host
        var emv_data = new Windows.Foundation.Collections.StringMap
        {
            { "8a", "abc123" },
            { "91", "cba312" },
            { "92", "bac213" },
        };
        var host_transaction = event.GetHostTransaction();
        var auth_amount = new Decimal(0);
        if (host_transaction)
        {
            if (host_transaction.TotalAmount() != null)
            {
                auth_amount = Decimal.FromDouble(Double.Parse(host_transaction.TotalAmount());
            }
        }
        payment_sdk_.TransactionManager.RespondToHostAuthorization(
            "123456", // authorization code
            PaymentSDK.HostDecisionType.HOST_AUTHORIZED,  // host decision
            emv_data,  // emv tags
            auth_amount); //authorization amount
    }
    else
    {
        // Handle failure by examining the status code and message.
    }
}

// ...
// Link event handler after initialization is complete
host_authorization_event_handler = async (sender, args) =>
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () => HandleEvent(args));

    payment_sdk_.TransactionManager.HandleHostAuthorizationEvent +=
        host_authorization_event_handler;
};
</code></pre>

{% endtab %}

{% tab title="C++" %}
{% code lineNumbers="true" %}

```cpp
    const std::shared_ptr<verifone_sdk::HostAuthorizationEvent>& event) override {
  if (event->getStatus() == verifone_sdk::StatusCode::SUCCESS) {
    // use event data to communicate with the host
    std::unordered_map<std::string, std::string> emv_data;
    auto host_transaction = event->getHostTransaction();
    std::optional<verifone_sdk::Decimal> auth_amount;
    if (host_transaction) {
      auth_amount = verifone_sdk::Decimal::Parse(host_transaction->totalAmount.value_or(""));
    }
    emv_data["8a"] = "abc123";
    emv_data["91"] = "cba312";
    emv_data["92"] = "bac213";
    transaction_manager_->respondToHostAuthorization(
        "123456", // authorization code
        verifone_sdk::HostDecisionType::HOST_AUTHORIZED, // host decision
        emv_data, // emv tags
        auth_amount); // authorized amount
  } else {
    // Handle failure by examining the status code and message.
  }
}
```

{% endcode %}
{% endtab %}

{% tab title=".NET" %}
{% code lineNumbers="true" %}

```aspnet
public void HandleHostAuthorizationEvent(HostAuthorizationEvent sdk_event)
{
    if (sdk_event.Status == 0)
    {
        // use event data to communicate with the host
        var emv_data = new Dictionary<string, string>
        {
            { "8a", "abc123" },
            { "91", "cba312" },
            { "92", "bac213" },
        };
        var host_transaction = sdk_event.HostTransaction;
        var auth_amount = new VerifoneSdk.Decimal(0);
        if (host_transaction != null)
        {
            if (host_transaction.Value.TotalAmount != null)
            {
                auth_amount = Decimal.FromDouble(Double.Parse(host_transaction.Value.TotalAmount);
            }
        }
        mw.Dispatcher.Invoke(() => { mw.payment_sdk_.TransactionManager.RespondToFinalizeTransaction(
            "123456", // authorization code
            VerifoneSdk.HostDecisionType.HOST_AUTHORIZED,  // host decision
            emv_data,  // emv tags
            auth_amount);}); //authorization amount

    }
    else
    {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}
{% endtabs %}

{% hint style="info" %}
**See also**

* [HostAuthorizationEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostauthorizationevent)
* [StatusCode](https://docs.verifone.com/psdk-api-latest/android-java/index/statuscode)
* [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal)
* [HostDecisionType](https://docs.verifone.com/psdk-api-latest/android-java/index/hostdecisiontype)
  {% endhint %}

## Finalizing a Host Transaction

During a transaction when the payment application requires the host to finalize the transaction it sends the [HostFinalizeTransactionEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostfinalizetransactionevent) to the [CommerceListenerAdapter](https://app.gitbook.com/s/yzyMJNwlQJZoQOIC8vZ8/api/moduleindex-4/_commerce_listener_adapter_8java) which was previously created.

When you receive the [HostFinalizeTransactionEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostfinalizetransactionevent) it will contain information about the payment that you as the client will be required to send to your host for finalizing the transaction. Once you have a response from your host you must then forward the details back to the PSDK using the [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal). The response must contain the auth code, host decision, and any EMV data supplied by your host response.

If you receive a [HostFinalizeTransactionEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostfinalizetransactionevent) then you must provide a response through [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal).

This event has apis for getting the [HostPaymentContext](https://docs.verifone.com/psdk-api-latest/android-java/index/hostpaymentcontext), [HostPaymentData](https://docs.verifone.com/psdk-api-latest/android-java/index/hostpaymentdata), [HostTransaction](https://docs.verifone.com/psdk-api-latest/android-java/index/hosttransaction), and [HostSalesData](https://docs.verifone.com/psdk-api-latest/android-java/index/hostsalesdata).

{% tabs fullWidth="false" %}
{% tab title="Java" %}
{% code lineNumbers="true" fullWidth="true" %}

```java
@Override // Overridden from the CommerceListenerAdapter
public void handleHostFinalizeTransactionEvent(HostFinalizeTransactionEvent event) {
   if (event.getStatus() == StatusCode.SUCCESS) {
        // use event data to communicate with the host
        HostTransaction hostTransaction = event.getHostTransaction();
        BigDecimal authAmount = ConversionUtility.parseAmount(0.00);
        if (hostTransaction != null && hostTransaction.getTotalAmount() != null) {
            authAmount = ConversionUtility.parseAmount(hostTransaction.getTotalAmount());
        }
        HashMap<String, String> emvData = new HashMap<>();
        emvData.put("8a", "abc123");
        emvData.put("91", "cba312");
        emvData.put("92", "bac213");
        transactionManager.respondToHostFinalizeTransaction(
            "123456",
            HostDecisionType.HOST_AUTHORIZED,
            emvData,
            Decimal.valueOf(authAmount));
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code lineNumbers="true" %}

```kotlin
 // Overridden from the CommerceListenerAdapter
@Override fun handleHostFinalizeTransactionEvent(event: HostFinalizeTransactionEvent) {
    if (event.getStatus() == StatusCode.SUCCESS) {
        // use event data to communicate with the host
        val hostTransaction = event.getHostTransaction()
        var authAmount = ConversionUtility.parseAmount(0.00)
        if (hostTransaction != null && hostTransaction.getTotalAmount() != null) {
            authAmount = ConversionUtility.parseAmount(hostTransaction.getTotalAmount())
        }
        val emvData = mutableMapOf("8a" to "abc123",
            "91" to "cba312",
            "92" to "bac213")
        transactionManager.respondToHostFinalizeTransaction(
            "123456",
            HostDecisionType.HOST_AUTHORIZED,
            emvData,
            Decimal.valueOf(authAmount))
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
// Overridden from the VFICommerceListenerAdapter
override func handle(_ event: VFIHostFinalizeTransactionEvent?) {
    if (event?.getStatus() == VFIStatusCodeSuccess) {
        // use event data to communicate with the host
        let emvData = ["8a": "abc123", "91": "cba312", "92": "bac213"]
        var amount = VFIDecimal.init(valueDecimal: Decimal.init(0.00))
        if let total = event?.getHostTransaction()?.totalAmount {
            amount = VFIDecimal.init(valueDecimal: Decimal.init(string: total) ?? 0.0)
        }
        sdk?.getTransactionManager()?.respond(
            toHostFinalizeTransaction: "123456",
            hostDecision: VFIHostDecisionTypeHOSTAUTHORIZED,
            emvTags: emvData,
            authAmount: amount)
    } else {
        // Handle failure by examining the status code and message.
    }
}
```

{% endcode %}
{% endtab %}

{% tab title="C#" %}

<pre class="language-csharp" data-line-numbers data-full-width="true"><code class="lang-csharp"><strong> private readonly EventHandler&#x3C;HostFinalizeTransactionEvent> host_finalize_transaction_event_handler;
</strong>
private void HandleEvent(HostFinalizeTransactionEvent event)
{
    if (event.Status == StatusCode.SUCCESS)
    {
        // use event data to communicate with the host
        var emv_data = new Windows.Foundation.Collections.StringMap
        {
            { "8a", "abc123" },
            { "91", "cba312" },
            { "92", "bac213" },
        };
        var host_transaction = event.GetHostTransaction();
        var auth_amount = new Decimal(0);
        if (host_transaction)
        {
            if (host_transaction.TotalAmount() != null)
            {
                auth_amount = Decimal.FromDouble(Double.Parse(host_transaction.TotalAmount());
            }
        }
        payment_sdk_.TransactionManager.RespondToFinalizeTransaction(
            "123456", // authorization code
            PaymentSDK.HostDecisionType.HOST_AUTHORIZED,  // host decision
            emv_data,  // emv tags
            auth_amount); //authorization amount
    }
    else
    {
        // Handle failure by examining the status code and message.
    }
}

// ...
// Link event handler after initialization is complete
host_finalize_transaction_event_handler = async (sender, args) =>
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () => HandleEvent(args));

    payment_sdk_.TransactionManager.HostFinalizeTransactionEvent +=
        host_finalize_transaction_event_handler;
};
</code></pre>

{% endtab %}

{% tab title="C++" %}
{% code lineNumbers="true" %}

```cpp
void handleHostFinalizeTransactionEvent(
    const std::shared_ptr<verifone_sdk::HostFinalizeTransactionEvent>& event) override {
  if (event->getStatus() == verifone_sdk::StatusCode::SUCCESS) {
    // use event data to communicate with the host
    std::unordered_map<std::string, std::string> emv_data;
    auto host_transaction = event->getHostTransaction();
    std::optional<verifone_sdk::Decimal> auth_amount;
    if (host_transaction) {
      auth_amount = verifone_sdk::Decimal::Parse(host_transaction->totalAmount.value_or(""));
    }
    emv_data["8a"] = "abc123";
    emv_data["91"] = "cba312";
    emv_data["92"] = "bac213";
    transaction_manager_->respondToHostFinalizeTransaction(
        "123456", // authorization code
        verifone_sdk::HostDecisionType::HOST_AUTHORIZED, // host decision
        emv_data, // emv tags
        auth_amount); // authorized amount
  } else {
    // Handle failure by examining the status code and message.
  }
}
```

{% endcode %}
{% endtab %}

{% tab title=".NET" %}
{% code lineNumbers="true" %}

```aspnet
private readonly EventHandler<HostFinalizeTransactionEvent> host_finalize_transaction_event_handler;

private void HandleEvent(HostFinalizeTransactionEvent event)
{
    if (event.Status == StatusCode.SUCCESS)
    {
        // use event data to communicate with the host
        var emv_data = new Windows.Foundation.Collections.StringMap
        {
            { "8a", "abc123" },
            { "91", "cba312" },
            { "92", "bac213" },
        };
        var host_transaction = event.GetHostTransaction();
        var auth_amount = new Decimal(0);
        if (host_transaction)
        {
            if (host_transaction.TotalAmount() != null)
            {
                auth_amount = Decimal.FromDouble(Double.Parse(host_transaction.TotalAmount());
            }
        }
        payment_sdk_.TransactionManager.RespondToFinalizeTransaction(
            "123456", // authorization code
            PaymentSDK.HostDecisionType.HOST_AUTHORIZED,  // host decision
            emv_data,  // emv tags
            auth_amount); //authorization amount
    }
    else
    {
        // Handle failure by examining the status code and message.
    }
}

// ...
// Link event handler after initialization is complete
host_finalize_transaction_event_handler = async (sender, args) =>
{
    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () => HandleEvent(args));

    payment_sdk_.TransactionManager.HostFinalizeTransactionEvent +=
        host_finalize_transaction_event_handler;
};
```

{% endcode %}
{% endtab %}
{% endtabs %}

{% hint style="info" %}
**See also**

* [HostFinalizeTransactionEvent](https://docs.verifone.com/psdk-api-latest/android-java/index/hostfinalizetransactionevent)
* [StatusCode](https://docs.verifone.com/psdk-api-latest/android-java/index/statuscode)
* [TransactionManager.respondToHostFinalizeTransaction(…)](https://docs.verifone.com/psdk-api-latest/android-java/index/transactionmanager#respondtohostfinalizetransaction-string-hostdecisiontype-hashmapstringstring-decimal)
* [HostDecisionType](https://docs.verifone.com/psdk-api-latest/android-java/index/hostdecisiontype)
  {% endhint %}

***

{% columns %}
{% column width="25%" %}

<figure><img src="/files/9ezXRridnCaI1awLr3X9" alt="" width="150"><figcaption></figcaption></figure>
{% endcolumn %}

{% column width="25%" %}

{% endcolumn %}

{% column width="16.66666666666666%" %}
**Version:**\
**Date:**
{% endcolumn %}

{% column width="33.333333333333336%" %} <code class="expression">space.vars.psdk\_version</code>\ <code class="expression">space.vars.psdk\_date</code>
{% endcolumn %}
{% endcolumns %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.verifone.com/psdk-latest/psdk-user-guide-and-training/psdk-user-guide/slim_integrated_host.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.