Other articles that helped me:
https://www.youtube.com/watch?v=oWK7kesoCQY&t=172s
Other cloud function methods
https://medium.com/@brinorw24/using-stripe-connect-with-flutterflow-1929346c6dc3
This is my code for cloud function payout method:
const functions = require('firebase-functions');const admin = require("firebase-admin");admin.initializeApp();const axios = require('axios');const stripe = require("stripe")(functions.config().stripe.token);exports.stripeWebhook = functions.https.onRequest(async (req, res) => { try { const whSec = functions.config().stripe.payments_webhook_secret; // Verify the Stripe webhook event signature const event = stripe.webhooks.constructEvent( req.rawBody, req.headers["stripe-signature"], whSec ); if (event.type === 'checkout.session.completed') { const session = event.data.object; const stripeAccountID = session.client_reference_id; const amountTotal = session.amount_total; const paymentIntent = session.payment_intent; const payeeRef = session.metadata.payeeRef; const payorRef = session.metadata.payorRef; const payeeUsername = session.metadata.payeeUsername; // Construct and send a transfer API call try { const transferResponse = await axios.post('https://api.stripe.com/v1/transfers', { amount: amountTotal, currency: 'usd', description: 'trush Tips', destination: stripeAccountID, // Add other relevant data }, {headers: { 'Authorization': Bearer ${functions.config().stripe.token}, 'Content-Type': 'application/x-www-form-urlencoded'} }); console.log(transferResponse.data); res.status(200).send('Tips transfer processed successfully'); const transferID = transferResponse.data.id; // Update Firestore document with success information await admin.firestore().collection("tipOrPayout").doc().set({ tipOrPayout: "tips", // Adjust field name to lowercase with underscores amount: amountTotal, paymentIntentID: paymentIntent, transferID: transferID, payeeUsername: payeeUsername, payeeRef: payeeRef, payorRef: payorRef, status: "Success", // Adjust to "Success" (capitalized first letter) refund: false, }); } catch (transferApiError) { console.error('Transfer API call failed:', transferApiError); res.status(500).send('Error processing webhook, transfer API call failed'); // Handle the refund API call and Firestore document update try { const refundResponse = await axios.post('https://api.stripe.com/v1/refunds', { payment_intent: paymentIntent, // Add other relevant data }, { headers: { 'Authorization': Bearer ${functions.config().stripe.token}, 'Content-Type': 'application/x-www-form-urlencoded' } }); console.log(refundResponse.data); // Update Firestore document with refund information await admin.firestore().collection("tipOrPayout").doc().set({ tipOrPayout: "tips", // Adjust field name to lowercase with underscores amount: amountTotal, paymentIntentID: paymentIntent, transferID: "n/a", payeeUsername: payeeUsername, payeeRef: payeeRef, payorRef: payorRef, status: "Refunded", // Adjust to "Refunded" (capitalized first letter) refund: false, }); } catch (refundApiError) { console.error('Refund API call failed:', refundApiError); // Handle refund API call errors here // Update Firestore document with failed refund information await admin.firestore().collection("tipOrPayout").doc().set({ tipOrPayout: "tips", // Adjust field name to lowercase with underscores amount: amountTotal, paymentIntentID: paymentIntent, transferID: "n/a", payeeUsername: payeeUsername, payeeRef: payeeRef, payorRef: payorRef, status: "Failed", // Adjust to "Failed" (capitalized first letter) refund: true, }); } } } else { res.status(400).send('Unhandled event type'); } } catch (err) { console.error("Webhook signature verification failed:", err); res.sendStatus(400); }});