Stripe and Firestore - node.js

Question

I am trying to get Stripe server code working using Firestore. I found example server code that uses Firebase RTDB and am having trouble converting this code to use Firestore.
Original Firebase Function code using Real Time Database:
const functions = require('firebase-functions')
const admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase);
const stripe = require('stripe')(functions.config().stripe.testkey)
exports.stripeCharge = functions.database
.ref('/payments/{userId}/{paymentId}')
.onWrite(event => {
const payment = event.data.val();
const userId = event.params.userId;
const paymentId = event.params.paymentId;
// checks if payment exists or if it has already been charged
if (!payment || payment.charge) return;
return admin.database()
.ref(`/users/${userId}`)
.once('value')
.then(snapshot => {
return snapshot.val();
})
.then(customer => {
const amount = payment.amount;
const idempotency_key = paymentId; // prevent duplicate charges
const source = payment.token.id;
const currency = 'usd';
const charge = {amount, currency, source};
return stripe.charges.create(charge, { idempotency_key });
})
.then(charge => {
admin.database()
.ref(`/payments/${userId}/${paymentId}/charge`)
.set(charge)
})
});
My attempt to convert this to using Firestore:
const functions = require('firebase-functions')
const admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)
const stripe = require('stripe')(functions.config().stripe.testkey)
exports.stripeCharge = functions.firestore
.document('/users/{userId}/payments/{paymentId}')
.onWrite(event => {
const payment = event.data
const userId = event.params.userId
const paymentId = event.params.paymentId
// checks if payment exists or if it has already been charged
if (!payment || payment.charge) return
return admin.firestore
.document(`/users/${userId}`)
.get()
.then(snapshot => {
return snapshot
})
.then(customer => {
const amount = payment.amount;
const idempotency_key = paymentId // prevent duplicate charges
const source = payment.token.id
const currency = 'usd'
const description = 'irl Map Fine Print'
const charge = {amount, currency, source}
return stripe.charges.create(charge, { idempotency_key })
})
.then(charge => {
admin.firestore
.fieldValue(`/users/${userId}/payments/${paymentId}/charge`)
.set(charge)
})
})
My version fails with error saying that admin.firestore.document is not a function.

Answer 1

This updated code will work for you! There were several issues with your code: Missing parentheses... incorrect use of fieldValue (though I am not sure how to use this correctly)... 'document' should be 'doc'
But this works:
const functions = require('firebase-functions')
const admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)
const stripe = require('stripe')(functions.config().stripe.token)
exports.stripeCharge = functions.firestore
.document('/users/{userId}/payments/{paymentId}')
.onWrite(event => {
const payment = event.data.data()
const userId = event.params.userId
const paymentId = event.params.paymentId
// checks if payment exists or if it has already been charged
if (!payment || payment.charge) return
return admin.firestore()
.doc(`/users/${userId}`)
.get()
.then(snapshot => {
return snapshot
})
.then(customer => {
const amount = payment.price * 100 // amount must be in cents
const idempotency_key = paymentId // prevent duplicate charges
const source = payment.token.id
const currency = 'usd'
const description = 'irl Map Fine Print'
const charge = {amount, currency, source}
return stripe.charges.create(charge, { idempotency_key })
})
.then(charge => {
admin.firestore()
.doc(`/users/${userId}/payments/${paymentId}`)
.set({
charge: charge
}, { merge: true })
})
})