I own the existing site at thepopupsystem.com and need it rebuilt under the new domain thepopuptournaments.com. The core concept stays the same—organising popup pickleball tournaments—but several features must be repaired or expanded while we keep only minor design tweaks in mind. Key deliverables • Round-robin engine: adjust the current match-making logic so every player meets any given opponent no more than twice during round-robin play. • Payments: integrate a Stripe credit-card checkout flow tied to each event registration. Players should be charged automatically once their spot is confirmed, with basic refund handling in the dashboard. • Email validation: block invalid or disposable email addresses at sign-up and during any profile edits, both client- and server-side. • Domain move: deploy the finished site to thepopuptournaments.com and ensure all links, assets and SSL certificates work. The visual look and feel can remain familiar; I’m only looking for light, tasteful changes—not a full redesign—so please be comfortable tweaking colours, spacing or typography without overhauling the current layout. You may refactor or rebuild the codebase in whatever modern stack you prefer, provided performance is solid and the admin experience stays intuitive. If you’ve shipped tournament schedulers, payment integrations or sports-club platforms before, that’s a huge plus—please share links.