Paywall
A paywall is a method of restricting access to content via a paid subscription. Beginning in the mid-2010s, newspapers started implementing paywalls on their websites as a way to increase revenue after years of decline in paid print readership and advertising revenue. In academics, research papers are often subject to a paywall and are available via academic libraries that subscribe.
PayPaI
Paypai (capitalised as PayPaI) is a phishing scam, which targets account holders of the widely used internet payment service, PayPal, taking advantage of the fact that a capital "i" may be difficult to distinguish from a lower-case "L" in some computer fonts. This is a form of a homograph attack.