> ## 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.

# Get Started with Go

> Send your first SMS using Go and the Gin framework with Plivo APIs

<Tabs>
  <Tab title="Go & Gin">
    # Get Started with Go Using the Gin Web Framework

    ## Sign up for a Plivo account

    When you [sign up with Plivo](https://cx.plivo.com/signup), we give you a free trial account and free credits to experiment with and learn about our services. You can [add a number](https://cx.plivo.com/phone-numbers) to your account to start testing the full range of our voice and SMS service features.

    Follow these steps to get a free trial account:

    1. [Sign up](https://cx.plivo.com/signup) with your work email address.
    2. Check your inbox for an activation email message from Plivo. Click on the link in the message to activate your account.
    3. Enter your mobile number to complete the phone verification step.

    ### Sign up with your work email address

    <Frame>
      <img src="https://mintcdn.com/plivo/Ac6PoKJHHxDx1U63/images/signup.png?fit=max&auto=format&n=Ac6PoKJHHxDx1U63&q=85&s=56190e6fffc6ae0c70dba8c7c69f435b" width="1440" height="900" data-path="images/signup.png" />
    </Frame>

    If you have any issues creating a Plivo account, please contact our [support team](https://support.plivo.com/hc/en-us/) for assistance.

    To get started, try sending an SMS message either by using our API and XML documents, or via {/* [PHLO](/phlo/) */}, our visual design tool, which allows you to create message flows using an intuitive canvas and deploy them with few clicks.

    <Tabs>
      <Tab title="Using API">
        ## Install Go, Gin, and the Plivo Go SDK

        You must set up and install Go, Gin, and Plivo’s Go SDK before you send your first SMS message.

        ### Install Go

        [Download and install Go](https://go.dev/dl/) from its official site.

        ### Install Plivo Go and Gin packages

        Create a projects directory and change into it.

        ```shell theme={null}
        $ mkdir mygoapp
        $ cd mygoapp
        ```

        Install the Plivo Go SDK and Gin packages using the `go` command.

        ```
        $ go get github.com/plivo/plivo-go/v7
        $ go get github.com/gin-gonic/gin
        ```

        You can also install them by cloning the [Plivo Go repository](https://github.com/plivo/plivo-go) and [Gin repository](https://github.com/gin-gonic/gin) into your `GOPATH`.

        Once you’ve set up your development environment, you can start sending and receiving messages using our APIs and XML documents. Here are three common use cases to get you started.

        ## Send your first outbound SMS/MMS message

        You must have a Plivo phone number to send messages to the US or Canada; you can rent a Plivo number from Phone Numbers > [Buy Numbers](https://cx.plivo.com/phone-numbers) on the Plivo console or via the [Numbers API](/numbers/api/phone-number#buy-a-phone-number).

        ### Set up a Gin server

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

        <Tabs>
          <Tab title="SMS">
            ```go theme={null}
            package main

            import (
            	"fmt"

            	"github.com/gin-gonic/gin"
            	"github.com/plivo/plivo-go/v7"
            )

            func main() {
            	r := gin.Default()
            	r.GET("/outbound-sms", func(c *gin.Context) {
            		c.Header("Content-Type", "application/JSON")
            		client, err := plivo.NewClient("<auth_id>", "<auth_token>", &plivo.ClientOptions{})
            		if err != nil {
            			fmt.Print("Error", err.Error())
            			return
            		}
            		response, err := client.Messages.Create(
            			plivo.MessageCreateParams{
            				Src:  "<sender_id>",
            				Dst:  "<destination_number>",
            				Text: "Hello, from Go Gin!",
            			},
            		)
            		if err != nil {
            			fmt.Print("Error", err.Error())
            			return
            		}
            		fmt.Printf("Response: %#v\n", response)
            		c.JSON(200, response)
            	})
            	r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
            }
            ```
          </Tab>

          <Tab title="MMS">
            ```go theme={null}
            package main

            import (
            	"fmt"

            	"github.com/gin-gonic/gin"
            	"github.com/plivo/plivo-go/v7"
            )

            func main() {
            	r := gin.Default()
            	r.GET("/outbound-mms", func(c *gin.Context) {
            		c.Header("Content-Type", "application/JSON")
            		client, err := plivo.NewClient("<auth_id>", "<auth_token>", &plivo.ClientOptions{})
            		if err != nil {
            			fmt.Print("Error", err.Error())
            			return
            		}
            		response, err := client.Messages.Create(
            			plivo.MessageCreateParams{
            				Src:       "<sender_id>",
            				Dst:       "<destination_number>",
            				Text:      "Hello, MMS from Go Gin!",
            				Type:      "mms",
            				MediaUrls: []string{"https://media.giphy.com/media/26gscSULUcfKU7dHq/source.gif"},
            				MediaIds:  []string{"801c2056-33ab-499c-80ef-58b574a462a2"},
            			},
            		)
            		if err != nil {
            			fmt.Print("Error", err.Error())
            			return
            		}
            		fmt.Printf("Response: %#v\n", response)
            		c.JSON(200, response)
            	})
            	r.Run() // listen and serve on 0.0.0.0:8080 (for Windows "localhost:8080")
            }
            ```
          </Tab>
        </Tabs>

        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). In countries other than the US and Canada you can use a [sender ID](/messaging/concepts/sender-id-usage/) for the message source.

        <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 `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.

        ```sh theme={null}
            go run SendSMS.go
        ```

        ## Receive your first inbound SMS/MMS message

        To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the [Numbers](https://cx.plivo.com/phone-numbers) page of the Plivo console or by using the [Numbers API](/numbers/).

        ### Set up a Gin server

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

        <Tabs>
          <Tab title="SMS">
            ```go theme={null}
            package main

            import (
              "net/http"
              "github.com/gin-gonic/gin"
            )

            func main() {
              r := gin.Default()
              r.GET("/receive_sms", func(c *gin.Context) {
                 fromnumber := c.Query("From")
                 tonumber := c.Query("To")
                 text := c.Query("Text")
                 c.String(http.StatusOK, "Message Received %s %s %s", fromnumber, tonumber, text)
              })
              r.Run() // listen and serve on 0.0.0.0:8080 (for Windows "localhost:8080")
            }
            ```
          </Tab>

          <Tab title="MMS">
            ```go theme={null}
            package main

            import (
              "net/http"
              "github.com/gin-gonic/gin"
            )

            func main() {
              r := gin.Default()
              r.GET("/receive_mms", func(c *gin.Context) {
                 fromnumber := c.Query("From")
                 tonumber := c.Query("To")
                 text := c.Query("Text")
                 media := c.Query("Media0")
                 c.String(http.StatusOK, "Message Received %s %s %s %s", fromnumber, tonumber, text, media)
              })
              r.Run() // listen and serve on 0.0.0.0:8080 (for Windows "localhost:8080")
            }
            ```
          </Tab>
        </Tabs>

        ### Test

        Save the file and run it.

        ```sh theme={null}
              go run receive_sms.go
        ```

        You should see your basic server application in action at [http://localhost:8080/receive\_sms/](http://localhost:8080/receive_sms/).

        ### Expose your local server to the internet

        To receive incoming messages, your local server must connect with Plivo API services. For that, we recommend using [ngrok](https://ngrok.com/download), which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

        <Frame>
          <img src="https://mintcdn.com/plivo/M2NzHE_bNZbCm0gd/images/ngrok-diagram.png?fit=max&auto=format&n=M2NzHE_bNZbCm0gd&q=85&s=b2ef4b4d52c133d126fd0d4303c33a61" alt="ngrok block diagram" width="1626" height="601" data-path="images/ngrok-diagram.png" />
        </Frame>

        Install ngrok and run it on the command line, specifying the port that  hosts the application on which you want to receive messages (8080 in this case):

        ```shell theme={null}
        $ ./ngrok http 8080
        ```

        This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

        <Frame>
          <img src="https://mintcdn.com/plivo/M2NzHE_bNZbCm0gd/images/ngrok.png?fit=max&auto=format&n=M2NzHE_bNZbCm0gd&q=85&s=ce35ccb7eebdb2af565a2a3a2cf2be18" alt="Sample ngrok CLI" width="786" height="238" data-path="images/ngrok.png" />
        </Frame>

        Now people can send messages to your Plivo number.

        ### Create a Plivo application to receive messages

        Associate the controller you created with Plivo by creating a Plivo application. Visiting Messaging > [Applications](https://cx.plivo.com/xml-applications) and click **Add New Application**. You can also use Plivo's [Application API](/account/api/application/#create-an-application).

        Give your application a name — we called ours `Receive SMS`. Enter the server URL you want to use (for example `https://<yourdomain>.com/receive_sms/`) in the `Message URL` field and set the method to `POST`. Click **Create Application** to save your application.

        <Frame>
          <img src="https://mintcdn.com/plivo/2OFvQXVNT3srKLUy/images/create_SMS_app.jpg?fit=max&auto=format&n=2OFvQXVNT3srKLUy&q=85&s=665006f2112a8e6113716029adfbf2a7" alt="Create Application" width="1440" height="785" data-path="images/create_SMS_app.jpg" />
        </Frame>

        ### Assign a Plivo number to your application

        Navigate to the [Numbers](https://cx.plivo.com/phone-numbers) page and select the phone number you want to use for this application.

        From the Application Type drop-down, select `XML Application`.

        From the Plivo Application drop-down, select `Receive SMS` (the name we gave the application).

        Click **Update Number** to save.

        <Frame>
          <img src="https://mintcdn.com/plivo/NFI9_HRHTMInDf93/images/assign_SMS_app.jpg?fit=max&auto=format&n=NFI9_HRHTMInDf93&q=85&s=94324dc41c7e8ade7a60c98e5fe20094" alt="Assign Phone Number to Receive SMS App" width="1440" height="785" data-path="images/assign_SMS_app.jpg" />
        </Frame>

        ### Test

        Send a text message to the Plivo number you specified using any phone.

        ## Reply to an incoming SMS/MMS message

        To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the [Numbers](https://cx.plivo.com/phone-numbers) page of the Plivo console or by using the [Numbers API](/numbers/).

        ### Set up a Gin server

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

        ```go theme={null}
        package main

        import (
           "github.com/gin-gonic/gin"
           "github.com/plivo/plivo-go/v7/xml"
        )

        func main() {
           r := gin.Default()
           r.GET("/reply_sms", func(c *gin.Context) {
               c.Header("Content-Type", "application/xml")
               fromnumber := c.Query("From")
               tonumber := c.Query("To")
               response := xml.ResponseElement{
                   Contents: []interface{}{
                       new(xml.MessageElement).
                           SetDst(tonumber).
                           SetSrc(fromnumber).
                           SetContents("This is an automatic response"),
                   },
               }
               c.String(200, response.String())
           })
           r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
        }
        ```

        If you haven’t done so already, [expose your local server to the internet](/sdk/server/set-up-go-dev-environment-api-messaging/#ngrok-setup).

        ### Create a Plivo application to reply to messages

        Associate the controller you created with Plivo by creating a Plivo application. Visiting Messaging > [Applications](https://cx.plivo.com/xml-applications) and click **Add New Application**. You can also use Plivo's [Application API](/account/api/application/#create-an-application).

        Give your application a name — we called ours `Reply Incoming SMS`. Enter the server URL you want to use (for example `http://<yourdomain>.com/replysms/`) in the `Message URL` field and set the method to `POST`. Click **Create Application** to save your application.

        <Frame>
          <img src="https://mintcdn.com/plivo/2OFvQXVNT3srKLUy/images/create_reply_sms.png?fit=max&auto=format&n=2OFvQXVNT3srKLUy&q=85&s=0371a975aa748267124e9ea9debc7a0f" alt="Create Application" width="1440" height="822" data-path="images/create_reply_sms.png" />
        </Frame>

        ### Assign a Plivo number to your application

        Navigate to the [Numbers](https://cx.plivo.com/phone-numbers) page and select the phone number you want to use for this application.

        From the Application Type drop-down, select `XML Application`.

        From the Plivo Application drop-down, select `Reply Incoming SMS` (the name we gave the application).

        Click **Update Number** to save.

        ### Test

        Run the code.

        ```shell theme={null}
        $ go run reply_sms.go
        ```

        Send a text message to the Plivo number you specified using any phone. You should receive a reply.

        ## More use cases

        We illustrate [more than a dozen use cases](/messaging/use-cases/send-an-sms/go/) with code for both API/XML and PHLO on our documentation pages.
      </Tab>
    </Tabs>
  </Tab>

  <Tab title="Go & Martini">
    # Get Started with Go Using Martini

    ## Sign up for a Plivo account

    When you [sign up with Plivo](https://cx.plivo.com/signup), we give you a free trial account and free credits to experiment with and learn about our services. You can [add a number](https://cx.plivo.com/phone-numbers) to your account to start testing the full range of our voice and SMS service features.

    Follow these steps to get a free trial account:

    1. [Sign up](https://cx.plivo.com/signup) with your work email address.
    2. Check your inbox for an activation email message from Plivo. Click on the link in the message to activate your account.
    3. Enter your mobile number to complete the phone verification step.

    ### Sign up with your work email address

    <Frame>
      <img src="https://mintcdn.com/plivo/Ac6PoKJHHxDx1U63/images/signup.png?fit=max&auto=format&n=Ac6PoKJHHxDx1U63&q=85&s=56190e6fffc6ae0c70dba8c7c69f435b" width="1440" height="900" data-path="images/signup.png" />
    </Frame>

    If you have any issues creating a Plivo account, please contact our [support team](https://support.plivo.com/hc/en-us/) for assistance.

    To get started, try sending an SMS message either by using our API and XML documents, or via {/* [PHLO](/phlo/) */}, our visual design tool, which allows you to create message flows using an intuitive canvas and deploy them with few clicks.

    <Tabs>
      <Tab title="Using API">
        ## Install Go, Martini, and the Plivo Go SDK

        You must set up and install Go, Martini, and Plivo’s Go SDK before you send your first SMS message.

        ### Install Go

        [Download and install Go](https://go.dev/dl/) from its official site.

        ### Install Plivo Go and Martini packages

        Create a projects directory and change into it.

        ```shell theme={null}
        $ mkdir mygoapp
        $ cd mygoapp
        ```

        Install the Plivo Go SDK and Martini packages using the `go` command.

        ```shell theme={null}
        $ go get github.com/plivo/plivo-go/v7
        $ go get github.com/go-martini/martini
        ```

        You can also install them by cloning the [Plivo Go repository](https://github.com/plivo/plivo-go) and [Martini repository](https://github.com/go-martini/martini) into your `GOPATH`.

        Once you’ve set up your development environment, you can start sending and receiving messages using our APIs and XML documents. Here are three common use cases to get you started.

        ## Send your first outbound SMS/MMS message

        You must have a Plivo phone number to send messages to the US or Canada; you can rent a Plivo number from Phone Numbers > [Buy Numbers](https://cx.plivo.com/phone-numbers) on the Plivo console or via the [Numbers API](/numbers/api/phone-number/#buy-a-phone-number).

        ### Set up a Martini server

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

        <Tabs>
          <Tab title="SMS">
            ```go theme={null}
            package main

            import (
            	"encoding/json"
            	"fmt"
            	"net/http"

            	"github.com/go-martini/martini"
            	"github.com/plivo/plivo-go/v7"
            )

            func main() {
            	m := martini.Classic()
            	m.Post("/send-sms/", func(w http.ResponseWriter, r *http.Request) string {
            		w.Header().Set("Content-Type", "application/json")

            		client, err := plivo.NewClient("<auth_id>", "<auth_token>", &plivo.ClientOptions{})
            		if err != nil {
            			fmt.Print("Error", err.Error())
            		}
            		response, err := client.Messages.Create(
            			plivo.MessageCreateParams{
            				Src:  "<sender_id>",
            				Dst:  "<destination_number>",
            				Text: "Hello, from Go Server!",
            			},
            		)
            		if err != nil {
            			fmt.Print("Error", err.Error())
            		}
            		resp, err := json.Marshal(response)
            		if err != nil {
            			fmt.Println("error:", err)
            		}
            		return string(resp)
            	})
            	m.Run()
            }
            ```
          </Tab>

          <Tab title="MMS">
            ```go theme={null}
            package main

            import (
            	"encoding/json"
            	"fmt"
            	"net/http"

            	"github.com/go-martini/martini"
            	"github.com/plivo/plivo-go/v7"
            )

            func main() {
            	m := martini.Classic()
            	m.Post("/reply-sms/", func(w http.ResponseWriter, r *http.Request) string {
            		w.Header().Set("Content-Type", "application/json")

            		client, err := plivo.NewClient("<auth_id>", "<auth_token>", &plivo.ClientOptions{})
            		if err != nil {
            			fmt.Print("Error", err.Error())
            		}
            		response, err := client.Messages.Create(
            			plivo.MessageCreateParams{
            				Src:       "<sender_id>",
            				Dst:       "<destination_number>",
            				Text:      "Hello, MMS from Go Server!",
            				Type:      "mms",
            				MediaUrls: []string{"https://media.giphy.com/media/26gscSULUcfKU7dHq/source.gif"},
            				MediaIds:  []string{"801c2056-33ab-499c-80ef-58b574a462a2"},
            			},
            		)
            		if err != nil {
            			fmt.Print("Error", err.Error())
            		}
            		resp, err := json.Marshal(response)
            		if err != nil {
            			fmt.Println("error:", err)
            		}
            		return string(resp)
            	})
            	m.Run()
            }
            ```
          </Tab>
        </Tabs>

        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). In countries other than the US and Canada you can use a [sender ID](/messaging/concepts/sender-id-usage/) for the message source.

        <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 `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.

        ```sh theme={null}
            go run SendSMS.go
        ```

        ## Receive your first inbound SMS/MMS message

        To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the [Numbers](https://cx.plivo.com/phone-numbers) page of the Plivo console or by using the [Numbers API](/numbers/).

        ### Set up a Martini server

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

        <Tabs>
          <Tab title="SMS">
            ```go theme={null}
            package main

            import (
            	"net/http"

            	"github.com/go-martini/martini"
            )

            func main() {
            	m := martini.Classic()
            	m.Post("/receive_sms/", func(w http.ResponseWriter, r *http.Request) string {
            		w.Header().Set("Content-Type", "application/text")

            		fromnumber := r.FormValue("From")
            		tonumber := r.FormValue("To")
            		text := r.FormValue("Text")
            		print("Message Received - ", fromnumber, " ", tonumber, " ", text)

            		return "Message Received"
            	})
            	m.Run()
            }
            ```
          </Tab>

          <Tab title="MMS">
            ```go theme={null}
            package main

            import (
            	"net/http"

            	"github.com/go-martini/martini"
            )

            func main() {
            	m := martini.Classic()
            	m.Post("/receive_sms/", func(w http.ResponseWriter, r *http.Request) string {
            		w.Header().Set("Content-Type", "application/text")

            		fromnumber := r.FormValue("From")
            		tonumber := r.FormValue("To")
            		text := r.FormValue("Text")
            		media := r.FormValue("Media0")
            		print("Message Received - ", fromnumber, " ", tonumber, " ", text, " ", media)

            		return "Message Received"
            	})
            	m.Run()
            }
            ```
          </Tab>
        </Tabs>

        ### Test

        Save the file and run it.

        ```sh theme={null}
            go run receive_sms.go
        ```

        You should see your basic server application in action at /receive\_sms/.

        ### Expose your local server to the internet

        To receive incoming messages, your local server must connect with Plivo API services. For that, we recommend using [ngrok](https://ngrok.com/download), which exposes local servers running behind NATs and firewalls to the public internet over secure tunnels. Using ngrok, you can set webhooks that can talk to the Plivo server.

        <Frame>
          <img src="https://mintcdn.com/plivo/M2NzHE_bNZbCm0gd/images/ngrok-diagram.png?fit=max&auto=format&n=M2NzHE_bNZbCm0gd&q=85&s=b2ef4b4d52c133d126fd0d4303c33a61" alt="ngrok block diagram" width="1626" height="601" data-path="images/ngrok-diagram.png" />
        </Frame>

        Install ngrok and run it on the command line, specifying the port that  hosts the application on which you want to receive messages (3000 in this case):

        ```shell theme={null}
        $ ./ngrok http 3000
        ```

        This starts the ngrok server on your local server. Ngrok will display a forwarding link that you can use as a webhook to access your local server over the public network.

        <Frame>
          <img src="https://mintcdn.com/plivo/M2NzHE_bNZbCm0gd/images/ngrok.png?fit=max&auto=format&n=M2NzHE_bNZbCm0gd&q=85&s=ce35ccb7eebdb2af565a2a3a2cf2be18" alt="Sample ngrok CLI" width="786" height="238" data-path="images/ngrok.png" />
        </Frame>

        Now people can send messages to your Plivo number.

        ### Create a Plivo application to receive messages

        Associate the controller you created with Plivo by creating a Plivo application. Visiting Messaging > [Applications](https://cx.plivo.com/xml-applications) and click **Add New Application**. You can also use Plivo's [Application API](/account/api/application/#create-an-application).

        Give your application a name — we called ours `Receive SMS`. Enter the server URL you want to use (for example `https://<yourdomain>.com/receive_sms/`) in the `Message URL` field and set the method to `POST`. Click **Create Application** to save your application.

        <Frame>
          <img src="https://mintcdn.com/plivo/2OFvQXVNT3srKLUy/images/create_SMS_app.jpg?fit=max&auto=format&n=2OFvQXVNT3srKLUy&q=85&s=665006f2112a8e6113716029adfbf2a7" alt="Create Application" width="1440" height="785" data-path="images/create_SMS_app.jpg" />
        </Frame>

        ### Assign a Plivo number to your application

        Navigate to the [Numbers](https://cx.plivo.com/phone-numbers) page and select the phone number you want to use for this application.

        From the Application Type drop-down, select `XML Application`.

        From the Plivo Application drop-down, select `Receive SMS` (the name we gave the application).

        Click **Update Number** to save.

        <Frame>
          <img src="https://mintcdn.com/plivo/NFI9_HRHTMInDf93/images/assign_SMS_app.jpg?fit=max&auto=format&n=NFI9_HRHTMInDf93&q=85&s=94324dc41c7e8ade7a60c98e5fe20094" alt="Assign Phone Number to Receive SMS App" width="1440" height="785" data-path="images/assign_SMS_app.jpg" />
        </Frame>

        ### Test

        Send a text message to the Plivo number you specified using any phone.

        ## Reply to an incoming SMS/MMS message

        To receive incoming messages, you must have a Plivo phone number that supports SMS; you can rent numbers from the [Numbers](https://cx.plivo.com/phone-numbers) page of the Plivo console or by using the [Numbers API](/numbers/).

        ### Set up a Martini server

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

        ```go theme={null}
        package main

        import (
        	"net/http"

        	"github.com/go-martini/martini"
        	"github.com/plivo/plivo-go/v7/xml"
        )

        func main() {
        	m := martini.Classic()
        	m.Post("/reply-sms/", func(w http.ResponseWriter, r *http.Request) string {
        		w.Header().Set("Content-Type", "application/xml")

        		fromnumber := r.FormValue("From")
        		tonumber := r.FormValue("To")

        		return xml.ResponseElement{
        			Contents: []interface{}{

        				new(xml.MessageElement).
        					SetCallbackMethod("POST").
        					SetCallbackUrl("https://foo.com/sms status/").
        					SetDst(fromnumber).
        					SetSrc(tonumber).
        					SetType("sms").
        					SetContents("This is an automatic response"),
        			},
        		}.String()
        	})
        	m.Run()
        }
        ```

        If you haven’t done so already, [expose your local server to the internet](/sdk/server/set-up-go-dev-environment-api-messaging/#ngrok-setup).

        ## Create a Plivo application to reply to messages

        Associate the controller you created with Plivo by creating a Plivo application. Visiting Messaging > [Applications](https://cx.plivo.com/xml-applications) and click **Add New Application**. You can also use Plivo's [Application API](/account/api/application/#create-an-application).

        Give your application a name — we called ours `Reply Incoming SMS`. Enter the server URL you want to use (for example `http://<yourdomain>.com/reply-sms/`) in the `Message URL` field and set the method to `POST`. Click **Create Application** to save your application.

        <Frame>
          <img src="https://mintcdn.com/plivo/2OFvQXVNT3srKLUy/images/create_reply_sms.png?fit=max&auto=format&n=2OFvQXVNT3srKLUy&q=85&s=0371a975aa748267124e9ea9debc7a0f" alt="Create Application" width="1440" height="822" data-path="images/create_reply_sms.png" />
        </Frame>

        ### Assign a Plivo number to your application

        Navigate to the [Numbers](https://cx.plivo.com/phone-numbers) page and select the phone number you want to use for this application.

        From the Application Type drop-down, select `XML Application`.

        From the Plivo Application drop-down, select `Reply Incoming SMS` (the name we gave the application).

        Click **Update Number** to save.

        ### Test

        Run the code.

        ```shell theme={null}
        $ go run reply_sms.go
        ```

        Send a text message to the Plivo number you specified using any phone. You should receive a reply.

        ## More use cases

        We illustrate [more than a dozen use cases](/messaging/use-cases/send-an-sms/go/) with code for both API/XML and PHLO on our documentation pages.
      </Tab>
    </Tabs>
  </Tab>
</Tabs>