michaelvillar/app.rb

## app.rb
require 'sinatra'
require 'stripe'

set :publishable_key, ENV['PUBLISHABLE_KEY']
set :secret_key, ENV['SECRET_KEY']

Stripe.api_key = settings.secret_key

get '/' do
  erb :index
end

post '/charge' do
  @amount = 500

  customer = Stripe::Customer.create(
    :email => 'customer@example.com',
    :card  => params[:stripeToken]
  )

  charge = Stripe::Charge.create(
    :amount      => @amount,
    :description => 'Sinatra Charge',
    :currency    => 'usd',
    :customer    => customer
  )

  erb :charge
end

__END__

@@ layout
  <!DOCTYPE html>
  <html>
  <head></head>
  <body>
    <%= yield %>
  </body>
  </html>

@@index
  <form action="/charge" method="post">
    <article>
      <label class="amount">
        <span>Amount: $5.00</span>
      </label>
    </article>

    <script src="https://checkout.stripe.com/v3/checkout.js" class="stripe-button" data-key="<%= settings.publishable_key %>"></script>
  </form>

@@charge
  <h2>Thanks, you paid <strong>$5.00</strong>!</h2>
	require 'sinatra'
	require 'stripe'

	set :publishable_key, ENV['PUBLISHABLE_KEY']
	set :secret_key, ENV['SECRET_KEY']

	Stripe.api_key = settings.secret_key

	get '/' do
	erb :index
	end

	post '/charge' do
	@amount = 500

	customer = Stripe::Customer.create(
	:email => 'customer@example.com',
	:card => params[:stripeToken]
	)

	charge = Stripe::Charge.create(
	:amount => @amount,
	:description => 'Sinatra Charge',
	:currency => 'usd',
	:customer => customer
	)

	erb :charge
	end

	__END__

	@@ layout
	<!DOCTYPE html>
	<html>
	<head></head>
	<body>
	<%= yield %>
	</body>
	</html>

	@@index
	<form action="/charge" method="post">
	<article>
	<label class="amount">
	<span>Amount: $5.00</span>
	</label>
	</article>

	<script src="https://checkout.stripe.com/v3/checkout.js" class="stripe-button" data-key="<%= settings.publishable_key %>"></script>
	</form>

	@@charge
	<h2>Thanks, you paid <strong>$5.00</strong>!</h2>