Send transactional messages with MessageBird WhatsApp API

index.js

const messagebird = require('messagebird')(process.env.MESSAGEBIRD_API_KEY, null, ["ENABLE_CONVERSATIONSAPI_WHATSAPP_SANDBOX"]);

const urlTracker = tracking_code => {
  if (tracking_code.slice(0, 2) == 'ME') {
    return 'https://melhorrastreio.com.br/rastreio/';
  }
  return 'https://www.linkcorreios.com.br/';
}

const sendWhatsApp = async function(phone, templateName, params) {
  return new Promise((resolve, reject) => {
    messagebird.conversations.start({
      'to': `55${phone}`,
      'channelId': process.env.MESSAGEBIRD_CHANNEL_ID,
      'type': 'hsm',
        'content': {
          'hsm': {
            'namespace': process.env.MESSAGEBIRD_TEMPLATE_NAMESPACE_API,
            'templateName': templateName,
            'language': {
              'policy': 'deterministic',
              'code': 'pt_BR'
            },
            'params': params
          }
        }
      }, function (err, response) {
        if (err) {
          return resolve(err);
        }
        console.log('whatsapp api sent!')
        return resolve(response);
      })
  })
}

export default async function handler(req, res) {

  if (req.method !== 'POST') {
    res.status(400).send({ message: 'Only POST requests allowed' })
    return
  }

  const { phone, order_id, tracking_code, first_name, last_name } = req.body

  if (phone && order_id && tracking_code && first_name) {

    const tracking_link = urlTracker(tracking_code) + tracking_code;

    const params = [
      {"default": first_name},
      {"default": tracking_link}
    ];
    
    const sendData = await sendWhatsApp(phone, 'tracking_code', params);
    const messageID = sendData.id;

    
    if (messageID) {
      return res.status(200).json({ 'Status': sendData });
    } else {
      console.log('error')
      return res.status(200).json(sendData);
    }

  } else {
    console.log('Empty tracking code')
    return res.status(200).send({ message: 'Empty tracking code' })
  }

}