PayPal’s online checkout empire is under siege as rivals squeeze its core business

PayPal helped invent online checkout. Nearly three decades later, it's struggling to defend its turf.
The iconic online payments company is facing its biggest challenge in nearly three decades of existence. Its core business of customers using the app to check out when shopping online is barely growing and new management has bluntly warned investors that "significant changes" will be needed to fix the company's problems.