Lambda code for the webhook

gistfile1.js

// Define some constants:
const SENDGRID_API_KEY = '' // API key for sendgrid
const SENDGRID_TEMPLATE_ID = '' // Create a template in Sendgrid, add the id here

const MOLLIE_TOKEN = 'live_...' // Mollie api token.

module.exports.webhook = async (event) => {

  // 1: Parse the event
  let realBody = JSON.parse(event.body)
  
  
  let amount = null
  let email = null
  let name = null
  let firstName = null
  let submissionId = realBody.data.submissionId

  for (let i = 0; i < realBody.data.fields.length; i++) {
    let item = realBody.data.fields[i];
    if (item.label === 'Totaal' && item.type === 'CALCULATED_FIELDS') {
      amount = item.value 
    }

    if (item.label === 'Email' && item.type === 'INPUT_EMAIL') {
      email = item.value 
    }

    if (item.label === 'Naam' && item.type === 'INPUT_TEXT') {
      name = item.value 
    }

    if (item.label === 'Details' && item.type === 'INPUT_TEXT') {
      firstName = item.value
    }
  }

  // Check required properties
  if (!amount || !email || !name || !firstName || !submissionId || !respondentId ) {
    return {
      statusCode: 400,
      body: JSON.stringify(
        {
          message: "Missing properties. Please fix me!",
          input: { amount, email, name, firstName, submissionId, respondentId },
        },
        null,
        2
      ),
    };
  }
  
  // 2: Create an order and send to Mollie
  var order = { amount, email, name, firstName, submissionId, respondentId }
  const response = await sendToMollie(order)
  
  
  // Check if we have a valid payment link from Mollie
  if (!response._links.paymentLink.href) {
    return {
      statusCode: 400,
      body: JSON.stringify(
        {
          message: "Something went wrong creating the payment request (mollie)",
          input: { response },
        },
        null,
        2
      ),
    };
  }
  
  // Add the paymentLink to the order
  order.paymentLink = response._links.paymentLink.href

  // 3: Send an e-mail using the sendgrid api
  let sendGridResponse = await sendPaymentEmail(order)

  return {
    statusCode: 200,
    body: JSON.stringify(
      {
        message: "Go Serverless v2.0! Your function executed successfully!",
        input: response,
      },
      null,
      2
    ),
  };
};

async function sendToMollie(order) {
  var myHeaders = new fetch.Headers();
  myHeaders.append("Authorization", `Bearer ${MOLLIE_TOKEN}`);
  myHeaders.append("Content-Type", "application/x-www-form-urlencoded");
  
  var urlencoded = new URLSearchParams();
  urlencoded.append("amount[currency]", "EUR");
  urlencoded.append("amount[value]", `${order.amount}.00`);
  urlencoded.append("description", `Order #${order.submissionId} - ${order.name}`);
  urlencoded.append("redirectUrl", "https://b-nys.com");
  
  var requestOptions = {
    method: 'POST',
    headers: myHeaders,
    body: urlencoded,
    redirect: 'follow'
  };
  
  const response = await fetch("https://api.mollie.com/v2/payment-links", requestOptions)
  if (response.status === 201) {
    return response.json() // Parse it
  } else {
    let responseText = await response.text()
    throw Error(`StatusCode: ${response.status} - ${responseText} for SendToMollie`)
  }
}

async function sendPaymentEmail(order) {
  try {
    var myHeaders = new fetch.Headers();
    myHeaders.append("Authorization", 'Bearer ' + SENDGRID_API_KEY);
    myHeaders.append("Content-Type", "application/json");

    var raw = JSON.stringify({
      "from": {
        "email": "info@burgerlijk.com",
        "name": "Burgerlijk"
      },
      "personalizations": [
        {
          "to": [
            {
              "email": order.email
            }
          ],
          "dynamic_template_data": order
        }
      ],
      "template_id": SENDGRID_TEMPLATE_ID
    });

    var requestOptions = {
      method: 'POST',
      headers: myHeaders,
      body: raw,
      redirect: 'follow'
    };

    const response = await fetch("https://api.sendgrid.com/v3/mail/send", requestOptions)
    return response
  } catch (error) {
    console.log('Failed Sendgrid -> ' + error.message)
  }
}