This is the official PayPal Express extension for Spree, based on the extension by PaulCC it has been extended to support Spree's Billing Integrations which allows users to configure the PayPal Express gateway including API login / password and signatures fields via the Admin UI.

This extension allows the store to use PayPal Express from two locations:

1. Checkout Payment - When configured the PayPal Express checkout button will appear alongside the standard credit card payment options on the payment stage of the standard checkout. The selected shipping address and shipping method / costs are automatically sent to the PayPal review page (along with detailed order information).

THIS FEATURE IS NOT YET COMPLETE 2. Cart Checkout - Presents the PayPal checkout button on the users Cart page and redirects the user to complete all shipping / addressing information on PaypPal's site. This also supports PayPal's Instant Update feature to retrieve shipping options live from Spree when the user selects / changes their shipping address on PayPal's site.

This extension follows the documented flow for a PayPal Express Checkout, where a user is forwarded to PayPal to allow them to login and review the order (possibly select / change shipping address and method), then the user is redirected back to Spree to confirm the order. The user MUST confirm the order on the Spree site before the payment is authorized / captured from PayPal (and the order is transitioned to the New state).

1. Setup your application

    cp config/database.yml.example config/database.yml
    rake db:bootstrap
   

   Go ahead and load sample data

   Fire it up to see that it works

   Shut it down

2. Configure PPE

   You'll need to have a Paypal developer account (developer.paypal.com) and both buyer and seller test accounts.

   Tip: these are sandbox only, so use email addresses and passwords that are easy to remember, e.g. [email protected] and [email protected].

   Your sandbox credentials are available from the API Credentials link.

   Start your app

    http://localhost:3000/admin/payment_methods/new
   

   Name: Paypal Express

   Environment: Development

   Active: Yes

   Provider: BillingIntegration::PaypalExpress

   Create

   Now add your credentials in the screen that follows

   review: unchecked [1]

   Signature: signature from your paypal seller test account

   Server: test

   Test Mode: checked

   Password: API Password from your paypal seller test account

   Login: API Username from your paypal seller test account

   Update

3. Test it

   Add an item to cart

   Check out

   Address step: complete it using a valid US address. (Use Sean Schofield's from the railsdog site ;))

   Delivery step: pick anything

   Payment step: pick Paypal Express. If this does not show up as an option, repeat Step 3.

   The Check out with PayPal button should appear.

   Make sure you're logged into your paypal developer account in another browser window before clicking it, as you'll be redirected to your test account (same browser, new window or tab).

   On Paypal's site (your previously configured Seller test account), log in as the Buyer.

   If you set up a test buyer account as [email protected] previously, use this now.

   You should now see the paypal order details screen with a Pay Now button.

   Click Pay Now

   You should now see the spree apps thank you for your order page

4. Check the payment

    http://localhost:3000/admin/orders
   

   Edit your new order

   Go to the Payments section from the right hand menu

   Pending Payments should show Paypal Express with the options of Show and Capture

   Click Show and look over the info available

   The payment has status Pending with a successful authorization

   Back to Payments

   This time click Capture, then OK

   Click Show to see what's changed.

   You should now see two transactions, the previous Authorize transaction and a new Capture one with status Completed

To automatically capture funds, add this to you site extension's activate method:

if Spree::Config.instance
  Spree::Config.set(:auto_capture => true)
end

[1] If you check the review checkbox in the admin section for Payment Methods/Paypal Express, the flow is slightly different. Instead of Pay Now on Paypal's order details page, it now says Continue. And the user is directed back to the spree app's Confirmation page showing a place order button. Use whichever suits your needs best. Personally, I leave review unchecked to cut down on the steps in the checkout flow.