create a customer when a payment happens

app/controllers/payments_controller.rb

@@ -11,12 +11,22 @@ module DiscourseSubscriptions
 
     def create
       begin
+        customer = ::Stripe::Customer.create(
+          email: current_user.email,
+        )
+
+        DiscourseSubscriptions::Customer.create(
+          user_id: current_user.id,
+          customer_id: customer[:id],
+        )
+
         payment = ::Stripe::PaymentIntent.create(
           payment_method_types: ['card'],
           payment_method: params[:payment_method],
           amount: params[:amount],
           currency: params[:currency],
-          confirm: true
+          confirm: true,
+          customer: customer[:id],
         )
 
         render_json_dump payment

spec/requests/payments_controller_spec.rb

@@ -25,12 +25,17 @@ module DiscourseSubscriptions
 
       describe "create" do
         it "creates a payment intent" do
+          ::Stripe::Customer.expects(:create).with(
+            email: user.email
+          ).returns(id: 'cus_87653')
+
           ::Stripe::PaymentIntent.expects(:create).with(
             payment_method_types: ['card'],
             payment_method: 'pm_123',
             amount: '999',
             currency: 'gdp',
-            confirm: true
+            confirm: true,
+            customer: 'cus_87653'
           )
 
           post "/s/payments.json", params: {