Submit email to Mailchimp via Netlify Form. Delete data from Netlify after submission to Mailchimp.

mailchimp_netlify_form.js

const axios = require('axios')
const crypto = require('crypto')

const region = process.env.MAILCHIMP_API_KEY.split('-')[1]

const apiRoot = `https://${region}.api.mailchimp.com/3.0/lists/${process.env.MAILCHIMP_LIST_ID}/members/`

function deleteSubmission(id) {
  const url = `https://api.netlify.com/api/v1/submissions/${id}?access_token=${process.env.NETLIFY_ACCESS_TOKEN}`
  return axios.delete(url)
}

exports.handler = async event => {
  const { id: mail_id, email } = JSON.parse(event.body).payload

  if (!email) {
    return {
      statusCode: 400,
      body: 'no email was provided',
    }
  }

  let emailhash = crypto
    .createHash('md5')
    .update(email)
    .digest('hex')

  await axios({
    method: 'put',
    url: apiRoot + emailhash,
    data: {
      email_address: email,
      status: 'subscribed',
    },
    auth: {
      username: 'anythingreally',
      password: process.env.MAILCHIMP_API_KEY,
    },
  }).catch(err => {
    console.log('error adding email to mailchimp', err.response.data.detail)
    return { statusCode: 500, body: JSON.stringify(err.response.data) }
  })

  await deleteSubmission(mail_id).catch(err => {
    console.log('error deleting email', email)
    return { statusCode: 500, body: JSON.stringify(err) }
  })

  return {
    statusCode: 200,
  }
}