create the token and make the customer request

app/controllers/customers_controller.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module DiscoursePatrons
+  class CustomersController < ::ApplicationController
+    include DiscoursePatrons::Stripe
+
+    before_action :set_api_key
+
+    def create
+      customer = ::Stripe::Customer.create(
+        email: current_user.email,
+        source: params[:source]
+      )
+
+      render_json_dump customer
+    end
+  end
+end

assets/javascripts/discourse/components/subscribe-card.js.es6

@@ -0,0 +1,7 @@
+export default Ember.Component.extend({
+  didInsertElement() {
+    this._super(...arguments);
+    this.cardElement.mount("#card-element");
+  },
+  didDestroyElement() {}
+});

assets/javascripts/discourse/controllers/patrons-index.js.es6

@@ -13,7 +13,7 @@ export default Ember.Controller.extend({
     },
 
     paymentSuccessHandler(paymentIntentId) {
-      DiscourseURL.redirectTo(`patrons/${paymentIntentId}`);
+      // DiscourseURL.redirectTo(`patrons/${paymentIntentId}`);
     }
   }
 });

assets/javascripts/discourse/controllers/patrons-subscribe.js.es6

@@ -1,11 +1,37 @@
-export default Ember.Controller.extend({
-  actions: {
-    stripePaymentHandler(/* data */) {
-      // console.log('stripePaymentHandler', data);
-    },
+import { ajax } from "discourse/lib/ajax";
 
-    paymentSuccessHandler(/* paymentIntentId */) {
-      // console.log('paymentSuccessHandler');
+export default Ember.Controller.extend({
+  init() {
+    this._super(...arguments);
+    this.set(
+      "stripe",
+      Stripe(Discourse.SiteSettings.discourse_patrons_public_key)
+    );
+    const elements = this.get("stripe").elements();
+    this.set("cardElement", elements.create("card", { hidePostalCode: true }));
+  },
+
+  actions: {
+    stripePaymentHandler() {
+      // https://stripe.com/docs/billing/subscriptions/payment#signup-flow
+
+      this.stripe.createToken(this.get("cardElement")).then(result => {
+        if (result.error) {
+          // Inform the customer that there was an error.
+          // var errorElement = document.getElementById('card-errors');
+          // errorElement.textContent = result.error.message;
+        } else {
+          const data = {
+            source: result.token.id
+          };
+
+          return ajax("/patrons/customers", { method: "post", data }).then(
+            result => {
+              // create subscription
+            }
+          );
+        }
+      });
     }
   }
 });

assets/javascripts/discourse/templates/components/subscribe-card.hbs

@@ -0,0 +1,2 @@
+
+<div id="card-element"></div>

assets/javascripts/discourse/templates/patrons/subscribe.hbs

@@ -13,8 +13,22 @@
   <div class="section-column">
     {{combo-box valueAttribute="id" content=model.plans value=model.plan}}
 
-    {{#d-button class="btn btn-primary btn-payment btn-discourse-patrons"}}
+    {{#d-button
+      action="stripePaymentHandler"
+      class="btn btn-primary btn-payment btn-discourse-patrons"}}
       {{i18n 'discourse_patrons.subscribe.buttons.subscribe'}}
     {{/d-button}}
+
+    <hr>
+
+    <h4>{{i18n 'discourse_patrons.subscribe.card.title'}}</h4>
+    {{subscribe-card cardElement=cardElement}}
+
+    <div id="discourse-patrons-subscribe-customer">
+      <h4>{{i18n 'discourse_patrons.subscribe.customer.title'}}</h4>
+      <div class="discourse-patrons-subscribe-customer-empty">
+        {{i18n 'discourse_patrons.subscribe.customer.empty'}}
+      </div>
+    </div>
   </div>
 </div>

config/locales/client.en.yml

@@ -20,6 +20,11 @@ en:
         subscribe: Subscribe
       subscribe:
         title: Subscribe
+        card:
+          title: Payment
+        customer:
+          title: Customer Details
+          empty: We couldn't find a customer identifier in our system. A new one will be created for you.
         buttons:
           subscribe: Subscribe
       one_time:

config/routes.rb

@@ -11,6 +11,7 @@ DiscoursePatrons::Engine.routes.draw do
     resources :subscriptions, only: [:index]
   end
 
+  resources :customers, only: [:create]
   resources :plans, only: [:index]
   resources :patrons, only: [:index, :create]
 

plugin.rb

@@ -41,6 +41,7 @@ after_initialize do
     "../app/controllers/admin_controller",
     "../app/controllers/admin/plans_controller",
     "../app/controllers/admin/subscriptions_controller",
+    "../app/controllers/customers_controller",
     "../app/controllers/patrons_controller",
     "../app/controllers/plans_controller",
     "../app/models/payment",

spec/requests/customers_controller_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+module DiscoursePatrons
+  RSpec.describe CustomersController do
+    describe "create" do
+      let(:user) { Fabricate(:user, email: 'hello.2@example.com') }
+
+      before do
+        sign_in(user)
+      end
+
+      it "creates a customer" do
+        ::Stripe::Customer.expects(:create).with(
+          email: 'hello.2@example.com',
+          source: 'tok_interesting'
+        )
+
+        post "/patrons/customers.json", params: { source: 'tok_interesting' }
+      end
+    end
+  end
+end

test/javascripts/acceptance/subscribe-test.js.es6

@@ -11,3 +11,11 @@ QUnit.test("subscribing", async assert => {
 
   assert.ok($("h3").length, "has a heading");
 });
+
+QUnit.test("subscribing with empty customer", async assert => {
+  await visit("/patrons/subscribe");
+  assert.ok(
+    $(".discourse-patrons-subscribe-customer-empty").length,
+    "has empty customer content"
+  );
+});