v0.1.1 of paymob_flutter

A Flutter SDK for Paymob payment gateway. Supports Card (WebView & Direct API), Mobile Wallet (Vodafone Cash, Orange Money, Etisalat, WE), and Kiosk (Fawry / Aman) payments. Changelog excerpt: ### Added - Wallet payment support (Vodafone Cash, Orange Money, Etisalat Cash, WE Pay) - Kiosk payment support (Fawry / Aman) - Native API payment flow without WebView - Animated payment states and transitions ### Improved - Better loading indicators - Improved error handling - Enhanced payment UX ### Fixed - Minor payment flow issues