posted an update

Here's a beaut that I learned along the way - A really nice library called 'Yup' that can be used for Express parameter validation.

exports.sendReceiptEmail = functions.https.onRequest((request, response) => {
  const schema = yup.object().shape({
    to: yup.string().email().required(),
    customer_name: yup.string().required(),
    merchant_name: yup.string().required(),
    card_brand: yup.string().required(),
    card_last_four: yup.string().required(),
    description: yup.string().required(),
    total: yup.string().required()

  schema.validate(request.body).catch(err => {
    return response.send(err, 400)
  // More code after here

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