PayPal Flexible Payment Portal & Subscription Setup

I already have a verified PayPal developer account and now need the entire PayPal Subscriptions flow built through the REST API so I can drop it straight into my WordPress site
—no off-the-shelf plugin, just clean API work... (Budget: $30 - $250 USD, Jobs: API Development, HTML, JavaScript, OAuth, Payment Gateway Integration, PayPal, PayPal API, PHP, REST API, WordPress)