I’m currently working on a new PayPal Payment API Plugin for Bubble.is, it’ll be a one time fee of $10 USD and is going to be available soon! 
But, I need some help with it, anyone able to help with it? There will be a 50/50 partnership going with this if someone is willing to help
EDIT: Cobubble has just released their own plugin which is free so I would recommend using their plugin! I won’t be doing my own plugin now as there’s no point