This project use as a demo of the MixPay+ intergration.
It only provide a webview, and inject the mixpayPlus object that MixPay checkout page required.
You can read this file on how it was done: https://github.com/MixPayProtocol/mixpay-plus-demo-android/blob/main/app/src/main/java/com/mathunion/mixpaydemo/WebViewActivity.kt