Is PayPal Stock a Buy?

Considering all of the investor interest in PayPal (PYPL -2.02%) stock, it might be surprising to hear that it's only gained 67% since it spun off from eBay in 2015, or about half of the S&P 500's gain over the same period. That's pretty depressing for shareholders.It hasn't always been this way. PayPal stock was beating the market for a long time before it plunged over the past two years. Why is the market so down on PayPal now? And does this recent underperformance present an opportunity?What's been going ...