dwindown 66e7b37f92 fix: resolve all Week 2 performance & security issues (F1.10–F1.19) ...

Security:
- Replace maybe_serialize() in cookies with json_encode() (PHP object injection fix)
- Add PayPal webhook signature verification
- Add current_user_can('manage_options') to all 18 admin-ajax handlers

Performance:
- Remove flush_rewrite_rules() from init hooks (Thankyou + Payment)
- Add activation/deactivation hooks for flush_rewrite_rules
- Cache currency, country, flags JSON reads in static variables
- Add server-side pagination to Customer::formipay_tabledata_customers()
- Optimize Order::formipay_tabledata_orders() with COUNT(*) GROUP BY

Cleanup:
- Delete Paypal.phpbak backup file
- Fix timezone hardcode Asia/Jakarta → wp_timezone_string()
- Create uninstall.php for proper cleanup on uninstall

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-04-17 19:52:01 +07:00

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