Never Commit Keys: Do not commit API keys to version control. Use environment variables or WordPress constants. Protect Secret Key: Your secret key must never appear in frontend code or be exposed publicly. Verify Signatures: Always verify webhook signatures using the Signing Secret to prevent spoofed payments. Use HTTPS Only: Ensure your webhook endpoint uses HTTPS with a valid SSL certificate. Secure Storage: Store Stripe credentials in WordPress options table, not in code or config files. PCI Compliance: Stripe handles PCI compliance. Never transmit raw card numbers to your server. Regular Updates: Keep Agency Pulse Invoice and all plugins updated for security patches. Monitor Logs: Regularly review Stripe and WordPress logs for suspicious activity. Test Before Live: Always complete