Please follow through the documentation as given in the following link as it narrates how to get the authentication done as paypal official documentation was creating issues while authenticating & also to know about the steps to create subscription.
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To start the app, follow this link : https://github.com/arunabharjun/paypal-payment/wiki/A.-PayPal-Payments
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To understand how the authentication works, follow this link : https://github.com/arunabharjun/paypal-payment/wiki/B.-How-to-authenticate
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Steps to create a subscription : https://github.com/arunabharjun/paypal-payment/wiki/C.-The-Subscriptions-API-by-PayPal
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Understanding this repository : https://github.com/arunabharjun/paypal-payment/wiki/D.-About-this-repository