I need Paytm seamlessly wired into my existing Laravel-based PHP application. The project is already live; I simply want users to complete checkout through Paytm and land back in the app with clear success, failure, or pending statuses recorded in my database. Here’s the flow I’m aiming for: • Collect the order details in Laravel, send them to Paytm through the official SDK or a well-maintained package. • Handle the callback/webhook so every transaction is verified with Paytm’s checksum logic before we mark it paid. • Surface meaningful error messages to the front-end if the payment is declined or times out. • Expose basic helper methods so I can trigger refunds or view transaction metadata later (code-level only; a UI is not required right now). I’ll share a Git repo and you can work on a separate branch. Deliver the updated code, .env sample entries, and a short README explaining any new routes, controllers, configs, and environment variables. If you’ve done Paytm integrations in Laravel before, let me know—linking to a past commit or demo will move you to the top of the list. Everything should run on Laravel 10, PHP 8.2, MySQL, and Sail/Docker in my dev environment with no breaking changes.