https://www.tipsandtricks-hq.com/ecommerce/how-to-add-a-subscription-button-for-recurring-payment-400

https://www.tipsandtricks-hq.com/wordpress-estore-plugin-complete-solution-to-sell-digital-products-from-your-wordpress-blog-securely-1059

http://www.woothemes.com/products/woocommerce-subscriptions/

http://www.gravityforms.com/add-ons/paypal/

In php:

https://developer.paypal.com/docs/classic/express-checkout/ht_ec-recurringPaymentProfile-curl-etc/

https://github.com/hrendoh/PayPal-Recurring-Payment-example

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