Express Checkout API Product Manager @ PayPal. Get in touch if you need any help with PayPal integrations or want to optimize your PayPal Express Checkout integration - I will try my best to help you out.
I am also in the process of setting up a developer panel to co-create some future APIs - get in touch if you would like to get a sneak peak and have your feedback heard on some exciting new things coming from the PayPal Checkout world.