Android Question Checkout using PayPal and webview

Hi All

I need to be able to accept payment for Physical goods & services from within the app.

The flow should be as follows:
1. App determines the item to be purchased & the price ( that is done )
2. The app somehow sends the info to PayPal/Stripe and opens a checkout page
3. The user completes the purchase
4. The app should be able to detect that the purchase was completed successfully (or not) and perhaps get a transaction reference number

I am wondering if anyone has a sample code that can be used with PayPal/Stripe and Webview

Thanks in advance
iCAB