> ## 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.

# Write an MMS Autoresponder

> Build an automated MMS reply system triggered by incoming messages

## Overview

This guide shows how to write an autoresponder for MMS text messages. Autoresponders can streamline marketing campaigns and subscription signups and reduce the amount of work humans have to do.

You can create an autoresponder either by using our PHLO visual workflow builder or our APIs. Follow the instructions in one of the tabs below.

<Tabs>
  <Tab title="Using API">
    Here’s how to use Plivo APIs to set up an MMS autoresponder.

    <h2 id="api-{{'Prerequisites' | slugify}}">Prerequisites</h2>

    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. 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](/docs/numbers/). If this is your first time using Plivo APIs, follow our instructions to set up a Go development environment.

    <h2 id="api-{{'Create the autoresponder application' | slugify}}">Create the autoresponder application</h2>

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

    ```go theme={null}
    package main

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

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

    func main() {
    	m := martini.Classic()

    	m.Post("/autoresponder/", func(w http.ResponseWriter, r *http.Request) string {
    		w.Header().Set("Content-Type", "application/xml")
    		from_number := r.FormValue("From")
    		to_number := r.FormValue("To")
    		text := r.FormValue("Text")
    		var body string
    		var media string
    		if strings.ToLower(text) == "hi" {
    			body = "Hello!"
    			media = "https://media.giphy.com/media/888R35MJTmDxQfRzfS/giphy.gif"
    		} else if strings.ToLower(text) == "bye" {
    			body = "Bye and have a nice day!"
    			media = "https://media.giphy.com/media/QM5lHSyFjz1XW/giphy.gif"
    		} else {
    			body = "I'm glad that we connected"
    			media = "https://media.giphy.com/media/888R35MJTmDxQfRzfS/giphy.gif"
    		}
    	
    		client, err := plivo.NewClient("<auth_id>", "<auth_token>",
    			&plivo.ClientOptions{})
    		if err != nil {
    			panic(err)
    		}
    		response, err := client.Messages.Create(plivo.MessageCreateParams{
    			Src:       to_number,
    			Dst:       from_number,
    			Text:      body,
    			Type:      "mms",
    			MediaUrls: []string{media},
    		})
    		if err != nil {
    			panic(err)
    		}
    		res, err := json.Marshal(response)
    		if err != nil {
    			fmt.Println("error:", err)
    		}
    		fmt.Printf("Response: %#v\n", res)
    		return string(res)
    	})
    	m.Run()
    }
    ```

    Save the file and run it.

    ```shell theme={null}
    go run autoresponder.go
    ```

    You should see your basic server application in action at [http://localhost:3000/autoresponder/](http://localhost:3000/autoresponder/).

    Set up ngrok to expose your local server to the internet.

    <h2 id="api-create-a-plivo-application-for-the-autoresponder">Create a Plivo application for the autoresponder</h2>

    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](/docs/account/api/application/#create-an-application).

    Give your application a name — we called ours `Autoresponder`. Enter the server URL you want to use (for example `https://<yourdomain>.com/autoresponder/`) 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/EvRfP72Bjs4tuRt5/images/create-app-autoresponder.png?fit=max&auto=format&n=EvRfP72Bjs4tuRt5&q=85&s=7f9aa51d5cbdd884072e6a53b53df53e" alt="Create Application" width="2874" height="1574" data-path="images/create-app-autoresponder.png" />
    </Frame>

    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 `Autoresponder` (the name we gave the application).

    Click **Update Number** to save.

    <Frame>
      <img src="https://mintcdn.com/plivo/NFI9_HRHTMInDf93/images/assign-app-autoresponder.png?fit=max&auto=format&n=NFI9_HRHTMInDf93&q=85&s=904f86e58fe21b0df89043205e9c74c6" alt="Assign Phone Number to Plivo Number" width="2870" height="1574" data-path="images/assign-app-autoresponder.png" />
    </Frame>

    <h2 id="Test">Test</h2>
    Send a text message to the Plivo number you specified using any phone.
  </Tab>
</Tabs>