Add stripe checkout for invoices

.env.example

@@ -29,3 +29,7 @@ NEW_RELIC_LICENSE_KEY='replace with newrelic licence key'
 
 # Redis url
 REDIS_URL='redis://127.0.0.1:6379/12'
+
+# Stripe
+STRIPE_PUBLISHABLE_KEY="pk_test_NOgckL4BT40aggiIRMiU8O2g00yhQxp1yS"
+STRIPE_SECRET_KEY="sk_test_0upT8snNIjPXvOteHwRKhOHK00dGraUDu5"

app/controllers/invoices/payments_controller.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+class Invoices::PaymentsController < ApplicationController
+  skip_before_action :authenticate_user!
+  skip_after_action :verify_authorized
+  before_action :load_invoice
+  before_action :ensure_invoice_unpaid, only: [:new]
+
+  def new
+    session = @invoice.create_checkout_session!(
+      success_url: success_invoice_payments_url(@invoice),
+      cancel_url: cancel_invoice_payments_url(@invoice)
+    )
+
+    redirect_to session.url, allow_other_host: true
+  end
+
+  def success
+    @invoice.paid!
+  end
+
+  def cancel
+    render
+  end
+
+  private
+
+    def load_invoice
+      @invoice = Invoice.includes(client: :company).find(params[:invoice_id])
+    end
+
+    def ensure_invoice_unpaid
+      if @invoice.paid?
+        redirect_to success_invoice_payments_url(@invoice.id)
+      end
+    end
+end

app/models/client.rb

@@ -12,6 +12,7 @@
 #  created_at   :datetime         not null
 #  updated_at   :datetime         not null
 #  discarded_at :datetime
+#  stripe_id    :string
 #
 # Indexes
 #
@@ -103,6 +104,22 @@ def client_overdue_and_outstanding_calculation
     }
   end
 
+  def register_on_stripe!
+    self.transaction do
+      customer = Stripe::Customer.create(
+        {
+          email:,
+          name:,
+          phone:,
+          metadata: {
+            platform_id: id
+          }
+        })
+
+      update!(stripe_id: customer.id)
+    end
+  end
+
   private
 
     def discard_projects

app/models/invoice.rb

@@ -68,4 +68,8 @@ def update_timesheet_entry_status!
     timesheet_entry_ids = invoice_line_items.pluck(:timesheet_entry_id)
     TimesheetEntry.where(id: timesheet_entry_ids).update!(bill_status: :billed)
   end
+
+  def create_checkout_session!(success_url:, cancel_url:)
+    InvoicePayment::Checkout.process(invoice: self, success_url:, cancel_url:)
+  end
 end

app/services/application_service.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class ApplicationService
+  def self.process(*args, &block)
+    new(*args, &block).process
+  end
+end

app/services/invoice_payment/checkout.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+module InvoicePayment
+  class Checkout < ApplicationService
+    def initialize(params)
+      @invoice = params[:invoice]
+      @company = invoice.client.company
+      @client = invoice.client
+      @success_url = params[:success_url]
+      @cancel_url = params[:cancel_url]
+    end
+
+    def process
+      Invoice.transaction do
+        ensure_client_registered!
+        checkout!
+      end
+    end
+
+    private
+
+      attr_reader :invoice, :company, :client, :success_url, :cancel_url
+
+      def ensure_client_registered!
+        return if client.stripe_id?
+
+        client.register_on_stripe!
+      end
+
+      def description
+        "Invoice from #{company.name} for #{currency} #{invoice.amount} due on #{invoice.due_date}"
+      end
+
+      def currency
+        company.base_currency
+      end
+
+      def checkout!
+        Stripe::Checkout::Session.create(
+          {
+            line_items: [{
+              price_data: {
+                currency: company.base_currency.downcase,
+                product_data: {
+                  name: invoice.invoice_number,
+                  description:
+                },
+                unit_amount: invoice.amount.to_i
+              },
+              quantity: 1
+            }],
+            mode: "payment",
+            customer: client.reload.stripe_id,
+            success_url:,
+            cancel_url:
+          })
+      end
+  end
+end

app/views/invoice_mailer/invoice.html.erb

@@ -14,6 +14,8 @@
       The due date is <%= @invoice.due_date %>.
     </p>
 
+    <p>You can pay for the invoice here: <%= link_to nil, new_invoice_payment_url(@invoice), target: "_blank", rel: "nofollow" %></p>
+
     <p>Thanks!</p>
   </body>
 </html>

app/views/invoice_mailer/invoice.text.erb

@@ -4,5 +4,7 @@ Hi, <%= @invoice.client_name %>
 You have an invoice - <%= @invoice.invoice_number %> with amount <%= @invoice.amount %>
 due date is: <%= @invoice.due_date %>.
 
+You can pay for the invoice here: <%= new_invoice_payment_url(@invoice) %>
+
 Thanks!
 Miru

app/views/invoices/payments/cancel.html.erb

@@ -0,0 +1,21 @@
+<div class="flex flex-col min-h-full pt-16 pb-12 my-auto">
+  <main class="flex flex-col self-center justify-center flex-grow w-full px-4 mx-auto max-w-7xl sm:px-6 lg:px-8">
+    <div class="flex justify-center flex-shrink-0">
+      <svg class="w-auto h-16 text-red-400 bg-red-200 rounded-full shadow-sm" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+        <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clip-rule="evenodd" />
+      </svg>
+    </div>
+
+    <div class="py-16">
+      <div class="text-center">
+        <p class="text-sm font-semibold tracking-wide uppercase text-miru-han-purple-600">Invoice #<%= @invoice.invoice_number %></p>
+        <h1 class="mt-2 text-4xl font-extrabold tracking-tight text-gray-900 sm:text-5xl">Payment was cancelled.</h1>
+        <p class="mt-2 text-base text-gray-500">Didn't cancel the payment?</p>
+        <div class="mt-6 group">
+          <%= link_to "Try again", new_invoice_payment_url(@invoice), class: "text-base font-medium text-miru-han-purple-600 group-hover:text-miru-han-purple-400", target: "_blank", rel: "nofollow" %>
+          <span aria-hidden="true" class="text-base font-medium text-miru-han-purple-600 group-hover:text-miru-han-purple-400"> &rarr;</span>
+        </div>
+      </div>
+    </div>
+  </main>
+</div>

app/views/invoices/payments/success.html.erb

@@ -0,0 +1,17 @@
+<div class="flex flex-col min-h-full pt-16 pb-12 my-auto">
+  <main class="flex flex-col self-center justify-center flex-grow w-full px-4 mx-auto max-w-7xl sm:px-6 lg:px-8">
+    <div class="flex justify-center flex-shrink-0">
+      <svg class="w-auto h-16 text-green-400 bg-green-200 rounded-full shadow-sm" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+        <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clip-rule="evenodd" />
+      </svg>
+    </div>
+
+    <div class="py-16">
+      <div class="text-center">
+        <p class="text-sm font-semibold tracking-wide text-indigo-600 uppercase">Invoice #<%= @invoice.invoice_number %></p>
+        <h1 class="mt-2 text-4xl font-extrabold tracking-tight text-gray-900 sm:text-5xl">Payment was successful. 🎉</h1>
+        <p class="mt-2 text-base text-gray-500">We have received your payment.</p>
+      </div>
+    </div>
+  </main>
+</div>

config/initializers/stripe.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+Stripe.api_key = ENV["STRIPE_SECRET_KEY"]

config/routes.rb

@@ -41,6 +41,15 @@ def draw(routes_name)
 
   resources :workspaces, only: [:update]
 
+  resources :invoices, only: [], module: :invoices do
+    resources :payments, only: [:new] do
+      collection do
+        get :success
+        get :cancel
+      end
+    end
+  end
+
   get "clients/*path", to: "clients#index", via: :all
   get "clients", to: "clients#index"
 

db/migrate/20220425074402_add_stripe_id_to_clients.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddStripeIdToClients < ActiveRecord::Migration[7.0]
+  def change
+    add_column :clients, :stripe_id, :string, default: nil
+  end
+end

spec/requests/invoices/payments_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "Invoices::Payments", type: :request do
+  describe "GET /index" do
+    pending "add some examples (or delete) #{__FILE__}"
+  end
+end