I need a lean, well-commented Android demo that shows how to connect a phone or tablet to the Teya.com terminal and run a complete “tap/insert/swipe → authorised/declined” flow. The core objective is payment processing, so the sample must: • Call the Teya SDK/API to initiate a card payment, • Listen for and surface payment-status callbacks, and • Push those updates to the screen through real-time notifications. A minimal UI is fine—one amount field, a “Pay” button, plus the notification logic covers my needs. Kotlin is ideal, but Java works if you wire everything cleanly. Please include in the repository: 1. Source code and Gradle project ready to open in Android Studio. 2. A short README explaining setup, sandbox credentials, and where in the code each Teya call occurs. 3. An APK I can sideload for quick testing. If you’ve integrated Teya or similar providers before, let me know; otherwise clear, traceable code and the ability to compile and run without surprises will be the key acceptance criteria.