script

purchasescript.js

 exports.onItemCreation = functions.firestore.document('purchases/{purchaseId}')
 .onCreate(async(snapshot, context) => {
     const itemDataSnap = await snapshot.ref.get()
     return admin.firestore().collection('mail').add({
        to: [itemDataSnap.data().email],
        message: {
          subject: 'Your reservation is here !',
          html: 'Hey '+ itemDataSnap.data().name +'. This is your reservation for the event and it costs $' + itemDataSnap.data().dollarqty +', thanks for the purchase.',
        }
      }).then(() => console.log('Queued email for delivery!'));
 });