Returning customer

# Accept a Payment with Elements and the Checkout Sessions API ## Set Price ID In the back end code, replace `{{PRICE_ID}}` with a Price ID (`price_xxx`) that you created. ## Running the sample 1. Build the server ~~~ bundle install ~~~ 2. Run the server ~~~ ruby server.rb -o 0.0.0.0 ~~~ 3. Go to [//localhost:4242/checkout.html](//localhost:4242/checkout.html)