What is the method for sending a WhatsApp message via MessageBird using a Firebase cloud function?

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Here is an example of how to send a WhatsApp message via MessageBird using a Firebase cloud function:

1. Install the MessageBird SDK and Firebase Admin SDK in your project:

npm install messagebird firebase-admin --save

1. Create a new cloud function in your Firebase project:

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();
const messagebird = require('messagebird')(functions.config().messagebird.key);

exports.sendWhatsAppMessage = functions.https.onCall(async (data, context) => {
  // Check that the user is authenticated
  if (!context.auth) {
    throw new functions.https.HttpsError('unauthenticated', 'The function must be called while authenticated.');
  }

  // Extract the message data from the request
  const { to, message } = data;

  // Send the message via MessageBird
  try {
    await messagebird.messages.create({
      to: `whatsapp:${to}`,
      from: 'whatsapp:+1234567890',
      type: 'text',
      content: {
        text: message,
      },
    });

    return { success: true };
  } catch (error) {
    console.error(error);
    throw new functions.https.HttpsError('unknown', 'An unknown error occurred while sending the WhatsApp message.');
  }
});

1. Add your MessageBird API key and WhatsApp number to your Firebase project:

firebase functions:config:set messagebird.key="YOUR_API_KEY" messagebird.whatsapp_number="+1234567890"

1. Call the cloud function from your client-side code:

const sendWhatsAppMessage = firebase.functions().httpsCallable('sendWhatsAppMessage');

sendWhatsAppMessage({ to: '+1234567890', message: 'Hello, world!' })
  .then((result) => {
    console.log(result.data);
  })
  .catch((error) => {
    console.error(error);
  });