Send a Facebook message with failover

In this example you will send a Facebook Messenger message that fails over to sending an SMS. In the Workflow object message objects can be placed in any order to suit your use case. Each message object must contain a failover object, except for the last message, as there are no more message objects to failover to.

For a step-by-step guide to this topic, you can read our tutorial Sending Facebook message with failover.

Example

Ensure the following variables are set to your required values using any convenient method:

Key Description
NEXMO_APPLICATION_ID The ID of the application that you created.
FROM_NUMBER The phone number you are sending the message from.
TO_NUMBER The phone number you are sending the message to.
FB_SENDER_ID Your Page ID. The FB_SENDER_ID is the same as the to.id value you received in the inbound messenger event on your Inbound Message Webhook URL.
FB_RECIPIENT_ID The PSID of the user you want to reply to. The FB_RECIPIENT_ID is the PSID of the Facebook User you are messaging. This value is the from.id value you received in the inbound messenger event on your Inbound Message Webhook URL.

NOTE: Don't use a leading + or 00 when entering a phone number, start with the country code, for example 447700900000.

Prerequisites

Create an application
If you do not have an application you can create one in the Messages and Dispatch tab in the Dashboard  . Also make sure you configure your webhooks  .

Write the code

Add the following to send-message-with-failover.sh:

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curl -X POST https://api.nexmo.com/v0.1/dispatch \
  -H 'Authorization: Bearer '$JWT\
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json' \
  -d $'{
    "template":"failover",
    "workflow": [
      {
        "from": { "type": "messenger", "id": '$FB_SENDER_ID' },
        "to": { "type": "messenger", "id": '$FB_RECIPIENT_ID' },
        "message": {
          "content": {
            "type": "text",
            "text": "This is a Facebook Messenger Message sent via the Dispatch API"
          }
        },
        "failover":{
          "expiry_time": 600,
          "condition_status": "read"
        }
      },
      {
        "from": {"type": "sms", "number": '$FROM_NUMBER'},
        "to": { "type": "sms", "number": '$TO_NUMBER'},
        "message": {
          "content": {
            "type": "text",
            "text": "This is an SMS sent via the Dispatch API"
          }
        }
      }
    ]
  }'

View full source 

Run your code

Save this file to your machine and run it:

$ bash send-message-with-failover.sh

Prerequisites

Create an application
If you do not have an application you can create one in the Messages and Dispatch tab in the Dashboard  . Also make sure you configure your webhooks  .

Write the code

Add the following to app.js:

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const Nexmo = require('nexmo')

const nexmo = new Nexmo({
  apiKey: NEXMO_API_KEY,
  apiSecret: NEXMO_API_SECRET,
  applicationId: NEXMO_APPLICATION_ID,
  privateKey: NEXMO_APPLICATION_PRIVATE_KEY_PATH
})

nexmo.dispatch.create("failover", [
  {
    "from": { "type": "messenger", "id": "FB_SENDER_ID" },
    "to": { "type": "messenger", "id": "FB_RECIPIENT_ID" },
    "message": {
      "content": {
        "type": "text",
        "text": "This is a Facebook Messenger message sent from the Dispatch API"
      }
    },
    "failover":{
      "expiry_time": 600,
      "condition_status": "read"
    }
  },
  {
    "from": {"type": "sms", "number": "FROM_NUMBER"},
    "to": { "type": "sms", "number": "TO_NUMBER"},
    "message": {
      "content": {
        "type": "text",
        "text": "This is an SMS sent from the Dispatch API"
      }
    }
  },
  (err, data) => { console.log(data.dispatch_uuid); }
])

View full source 

Run your code

Save this file to your machine and run it:

$ node app.js

Try it out

When you run the code it will attempt to send a message via FaceBook Messenger. This will fail and then a message will be sent via SMS to the destination number.