[Rails] Paypal automatic payment

Hello Everyone

I am using rails 3.2.8 and using Express checkout.

The concept is, once the user confirms shipping in Paypal website, next time I have to bill next time payments
automatically for that user.

So in my case its working now like every time user need to log-in when clicking Paypal button and have confirm shipping address.

But how can I implement, direct payment from our website for

all payments after the first time user confirms in paypal website.

I heard about reference transaction using Billing agreement id we can do automatic payment. But I didn't find any tutorial for rails.

Can you guys provide any tutorial links?

Thank you!

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