Paypal documentations

// paypal documentations
How to Create a Recurring Payments Profile with Express Checkout
https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/ht_ec-recurringPaymentProfile-curl-etc/

Handling Recurring Payments
https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/integration-guide/ECRecurringPayments/

GetRecurringPaymentsProfileDetails API Operation (NVP)
https://developer.paypal.com/webapps/developer/docs/classic/api/merchant/GetRecurringPaymentsProfileDetails_API_Operation_NVP/