I need a developer who can wire up Square’s credit- and debit-card processing to both my website and its companion mobile app. The job is straightforward: when a user taps “Pay”, the transaction should be routed through Square, tokenised, authorised and logged in my Square dashboard with full PCI compliance. The work includes • adding the Square Web Payments SDK to the site, • using the Square In-App Payments SDK (or equivalent) for iOS and Android, • creating the necessary server-side endpoints to handle nonce exchange and order capture, • returning clear success or error messages to the front-end, and • testing everything end-to-end in Sandbox first, then moving to Production. Acceptance will be based on: – a live checkout flow on web, iOS and Android that charges a real card for a small amount, – confirmation that the payment appears instantly in my Square dashboard, and – clean, well-commented code handed over in a Git repo. I’m looking to have this running as soon as humanly possible, so please only bid if you can jump in right away.