> ## Documentation Index
> Fetch the complete documentation index at: https://plivo.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Voice Notifications

> Send audio notifications via voice calls with text-to-speech or recordings

<Tabs>
  <Tab title="Node">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Node.js development environment](/sdk/server/set-up-node-dev-environment-api-xml-voice/).

        ## Create a voice notification application in Node.js

        Create a file called `Makecall.js` and paste into it this code.

        ```js theme={null}
        var plivo = require('plivo');

        (function main() {
            'use strict';

            var client = new plivo.Client("<auth_id>","<auth_token>");
            client.calls.create(
                "<caller_id>", // from
                "<destination_number>", // to
                "https://s3.amazonaws.com/static.plivo.com/notification.xml", // answer url
                {
                    answerMethod: "GET",
                },
            ).then(function (response) {
                console.log(response);
            }, function (err) {
                console.error(err);
            });
        })();
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use `process.env` to store environment variables and fetch them while initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        ```shell theme={null}
        $ node Makecall.js
        ```
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="Ruby">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Ruby development environment](/sdk/server/set-up-ruby-dev-environment-api-xml-voice/).

        ## Create a voice notification application in Ruby

        Create a file called `make_call.rb` and paste into it this code.

        ```rb theme={null}
        require 'rubygems'
        require 'plivo'

        include Plivo
        include Plivo::Exceptions

        api = RestClient.new("<auth_id>","<auth_token>")

        begin
          response = api.calls.create(
            '<caller_id>',
            ['<destination_number>'],
            'https://s3.amazonaws.com/static.plivo.com/notification.xml'
          )
          puts response
        rescue PlivoRESTError => e
          puts 'Exception: ' + e.message
        end
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use `ENV` to store environment variables and fetch them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        ```shell theme={null}
        $ ruby make_call.rb
        ```
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="Python">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Python development environment](/sdk/server/set-up-python-dev-environment-api-xml-voice/).

        ## Create a voice notification application in Python

        Create a file called `make_call.py` and paste into it this code.

        ```py theme={null}
        import plivo

        client = plivo.RestClient('<auth_id>','<auth_token>')
        response = client.calls.create(
            from='<caller_id>',
            to='<destination_number>',
            answer_url='https://s3.amazonaws.com/static.plivo.com/notification.xml',
            answer_method='GET', )
        print(response)
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use the os module (`os.environ`) to store environment variables and fetch them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        ```shell theme={null}
        $ python make_call.py
        ```
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="PHP">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a PHP development environment](/sdk/server/set-up-php-dev-environment-api-xml-voice/).

        ## Create a voice notification application in PHP

        Create a file called `MakeCall.php` and paste into it this code:

        ```php theme={null}
        <?php
        require 'vendor/autoload.php';
        use Plivo\RestClient;

        $auth_id    = "<auth_id>";
        $auth_token = "<auth_token>";
        $p          = new RestClient($auth_id, $auth_token);

        $response = $client->calls->create('<caller_id>',
                                         ['<destination_number>'],
                                         'https://s3.amazonaws.com/static.plivo.com/notification.xml',);
        print_r($response);
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use the `$_ENV` or `putenv/getenv` functions to store environment variables and fetch them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        ```shell theme={null}
        $ php MakeCall.php
        ```
      </Tab>
    </Tabs>
  </Tab>

  <Tab title=".NET">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Dotnet development environment](/sdk/server/set-up-dotnet-dev-environment-api-xml-voice/).

        ## Create a voice notification application in C\#

        In Visual Studio, open the file in the CS project called `Program.cs` and paste into it this code.

        ```cs theme={null}
        using System;
        using System.Collections.Generic;
        using Plivo;

        namespace testplivo
        {
            class Program
            {
                static void Main(string[] args)
                {
                    var api = new PlivoApi("<auth_id>","<auth_token>");
                    var response = api.Call.Create(
                        to: new List<String> { "<destination_number>" },
                        from: "<caller_id>",
                        answerMethod: "GET",
                        answerUrl: "https://s3.amazonaws.com/static.plivo.com/notification.xml"
                    );
                    Console.WriteLine(response);
                }
            }
        }
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use the `<a href="https://docs.microsoft.com/en-us/dotnet/api/system.environment.setenvironmentvariable?view=netcore-3.1" rel="nofollow">Environment.SetEnvironmentVariable</a>` method to store environment variables and `<a href="https://docs.microsoft.com/en-us/dotnet/api/system.environment.getenvironmentvariable?view=netcore-3.1" rel="nofollow">Environment.GetEnvironmentVariable</a>` to fetch them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        <Frame>
          <img src="https://mintcdn.com/plivo/NFI9_HRHTMInDf93/images/build_app.jpg?fit=max&auto=format&n=NFI9_HRHTMInDf93&q=85&s=57ed7d2310aa904fb31a34ad205f863c" alt="Make outbound call" width="1116" height="444" data-path="images/build_app.jpg" />
        </Frame>
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="Java">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Java development environment](/sdk/server/set-up-java-dev-environment-api-xml-voice/).

        ## Create a voice notification application in Java

        Create a Java class in the project  `MakeCall` and paste into it this code.

        ```java theme={null}
        import java.io.IOException;
        import java.util.Collections;
        import com.plivo.api.Plivo;
        import com.plivo.api.exceptions.PlivoRestException;
        import com.plivo.api.models.call.Call;
        import com.plivo.api.models.call.CallCreateResponse;

        class MakeCall {
            public static void main(String [] args) throws IOException, PlivoRestException {
                Plivo.init("<auth_id>","<auth_token>");
                CallCreateResponse response = Call.creator("<caller_id>",
                        Collections.singletonList("<destination_number>"),
                        "https://s3.amazonaws.com/static.plivo.com/notification.xml")
                        .answerMethod("GET")
                        .create();
                System.out.println(response);
            }
        }
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use `<a rel="nofollow" href="https://docs.oracle.com/javase/tutorial/essential/environment/env.html">System.getenv()</a>` to store environment variables and retrieve them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        <Frame>
          <img src="https://mintcdn.com/plivo/NFI9_HRHTMInDf93/images/build_app.jpg?fit=max&auto=format&n=NFI9_HRHTMInDf93&q=85&s=57ed7d2310aa904fb31a34ad205f863c" alt="Make outbound call" width="1116" height="444" data-path="images/build_app.jpg" />
        </Frame>
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="Go">
    ## Overview

    This guide shows how to send audio notifications using voice calls. You can play recorded audio when the call recipient answers or use text-to-speech, as we show here, combining static text with dynamic information that Plivo gets from a variable.

    You can use voice notification for use cases such as:

    * Order notification
    * Booking status
    * Delivery status
    * Flight cancellation/rescheduling
    * Two-factor authentication/one-time password
    * New offer notification
    * Account balance notification

    Implement voice notification either by using our PHLO visual workflow builder or our APIs and XML documents. Follow the instructions in one of the tabs below.

    <Tabs>
      <Tab title="Using XML">
        Here’s how to use Plivo APIs and XML to implement voice notifications.

        ## How it works

        <Frame>
          <img src="https://mintcdn.com/plivo/GjxgkWYDEc2_LVPj/images/outbound-calls.png?fit=max&auto=format&n=GjxgkWYDEc2_LVPj&q=85&s=f8b62e42991d9fd92d93eab071cb4124" alt="Outbound Call Flow" width="1448" height="774" data-path="images/outbound-calls.png" />
        </Frame>

        Plivo requests an answer URL when the call is answered (step 4) and expects the file at that address to hold a valid XML response from the application with instructions on how to handle the call. To see how this works, you can use [https://s3.amazonaws.com/static.plivo.com/notification.xml](https://s3.amazonaws.com/static.plivo.com/notification.xml) as an answer URL to test your first outgoing call. The file contains this XML code:

        ```xml theme={null}
        <Response>
        <Speak>Congratulations, your order was successfully placed</Speak>
        </Response>
        ```

        This code instructs Plivo to say, “Congratulations, your order was successfully placed” to the call recipient. You can find the entire list of valid Plivo XML verbs in our [XML Reference](/voice/xml/overview/) documentation.

        ## Prerequisites

        To get started, you need a Plivo account —  [sign up](https://cx.plivo.com/signup) with your work email address if you don’t have one already. If this is your first time using Plivo APIs, follow our instructions to [set up a Go development environment](/sdk/server/set-up-go-dev-environment-api-xml-voice/).

        ## Create a voice notification application in Go

        Create a file called `MakeCall.go` and paste into it this code.

        ```go theme={null}
        package main

        import "fmt"
        import "github.com/plivo/plivo-go/v7"

        func main() {
        	client, err := plivo.NewClient("<auth_id>","<auth_token>", &plivo.ClientOptions{})
        	if err != nil {
        			fmt.Print("Error", err.Error())
        			return
        		}
        	response, err := client.Calls.Create(
        		plivo.CallCreateParams{
        			From: "<caller_id>",
        			To: "<destination_number>",
        			AnswerURL: "https://s3.amazonaws.com/static.plivo.com/notification.xml",
        			AnswerMethod: "GET",
        		},
        	)
        	if err != nil {
        			fmt.Print("Error", err.Error())
        			return
        		}
        	fmt.Printf("Response: %#v\n", response)
        }
        ```

        Replace the auth placeholders with your authentication credentials from the [Plivo console](https://cx.plivo.com/home). Replace the phone number placeholders with actual phone numbers in [E.164 format](https://en.wikipedia.org/wiki/E.164) (for example, +12025551234).

        <Note>
          <strong>Note:</strong>
          We recommend that you store your credentials in the `auth_id` and `auth_token` environment variables, to avoid the possibility of accidentally committing them to source control. If you do this, you can initialize the client with no arguments and Plivo will automatically fetch the values from the environment variables. You can use the `os.Setenv` and `os.Getenv` functions to store environment variables and fetch them when initializing the client.
        </Note>

        ## Test

        Save the file and run it.

        ```shell theme={null}
        go run MakeCall.go
        ```
      </Tab>
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