working

.firebaserc

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+{
+  "projects": {
+    "default": "paymentintent"
+  }
+}

.gitignore

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+ios/Runner/GoogleService-Info.plist
+
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 5bedb7b1d5698ce2c1c67aaf9afae7b3948b172a
+  channel: beta
+
+project_type: app

README.md

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+# payment_intent
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

firebase.json

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+{
+  "firestore": {
+    "rules": "firestore.rules",
+    "indexes": "firestore.indexes.json"
+  },
+  "remoteconfig": {
+    "template": "remoteconfig.template.json"
+  }
+}

functions/.gitignore

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+node_modules/

functions/index.js

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+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+const stripe = require('stripe')(functions.config().stripe.secretkey, {apiVersion: '2019-05-16'});
+// 2020-08-27
+
+exports.pub_key = functions.https.onRequest(async (req, res) => {
+  res.json({ publishable_key: functions.config().stripe.pubkey });
+});
+
+exports.create_payment_intent = functions.https.onRequest(async (req, res) => {
+  try {
+    const paymentIntent = await stripe.paymentIntents.create({
+      amount: req.query.amount,
+      currency: req.query.currency,    
+    });
+    res.json({ clientSecret: paymentIntent.client_secret });
+  } catch(err) {
+    res.status(400).json({ error: { message: err.message } })
+  }
+});