Multi-Provider Payments Orchestrator (Stripe/PayPal/Payoneer/Paddle)

Fix fatal syntax error reported at line 20 (unexpected '=' expecting ')') by correcting invalid function/method signature or array syntax; then review entire plugin file for any other PHP syntax issues (mismatched parentheses/brackets, trailing commas incompatible with older PHP, namespaces/use statements, anonymous functions) and ensure the plugin loads without fatals. Keep functionality intact: settings page, provider registry, REST routes, shortcode, query var handler, WooCommerce order meta box, thankyou hook, user profile field, logging. Ensure compatibility with PHP 7.4+ and WordPress coding standards. Add minimal guards for missing WooCommerce classes/functions to avoid fatals.