Further research is needed to:
If you are looking to secure your own PayPal account: Paypal Account Checker Github
PayPal-Dev-Checker - A Python-based utility to verify the status of sandbox accounts via the PayPal REST API . 2. Key Features Use bullet points to highlight what the tool does: Paypal Account Checker Github Further research is needed to: If you are
Use tools like haveibeenpwned.com to see if your email and a known password are circulating in combo lists. If so, change your PayPal password . If so, change your PayPal password
GitHub hosts various types of repositories related to this topic, ranging from "educational" scripts to active malware: Legitimate Developer Tools: PayPal itself maintains official SDKs and APIs
PayPal has a public bug bounty program (through HackerOne). You can legally attempt to find vulnerabilities in PayPal's authentication system. If you find an API flaw that could be used as a checker, PayPal pays you (up to $10,000+).