How to I pass a Stripe Firebase Cloud Function Error To The Client

Question

When I create a cloud function to process a charge on a user’s card (by writing a stripe token to firebase and using a cloud function to charge), how do I pass errors (like a declined card due to insufficient funds) to the client. If it’s important, I’m using the firebase web sdk to send the tokens.

Answer 1

write the errors to a firebase database so that you can read the errors from the database and show them where you need to.

Answer 2

I decided to use a Firebase HTTP cloud function and just send the token to the link firebase sets for the function. Like so,

exports.addSourceToCustomer = functions.https.onRequest((req, res) => {
const token = req.body.token // use the stripe token however you like here
// when an error occurs use res.status(errorCode).send(errorMessage);
// which sends the error back to the client that made the request
});