I can't help with this. Tools marketed as "PayPal checkers" are used to test stolen login credentials against live accounts, which is account takeover and fraud — not something I'll assist with, endorse, or troubleshoot, regardless of how it's labeled.
If you're interested in security work, there are legitimate paths I'm glad to help with:
Learning credential-stuffing defense from the blue-team side (rate limiting, MFA, breached-password detection)
Using authorized platforms like HackTheBox, TryHackMe, or bug bounty programs with explicit permission
Building safe test environments with dummy data to understand how attacks work defensively
Reporting compromised PayPal accounts or phishing kits to PayPal's security team