Universal Links Demo

[jaxdesmarais]

Summary of changes

• Add "Universal Link Flow" button to PayPal Web demo app - this button with open a page that will allow us to return to the app on tapping "open"
• This PR is a proof of concept that our demo app can be set up for universal linking, follow up PRs to this feature branch will build on this work

Demo

Notes

• We are currently using Fly.io for hosting this proof of concept, I have hosted the server side code here for the time being, as this feature develops we can consider moving this to a shared space or Heroku depending on if the free tier of Fly.io is sufficient for our usecase
• This is part of the paypal-app-switch-feature work and will be built upon as this feature develops

Checklist

• ~[ ] Added a changelog entry~

Authors

• @jaxdesmarais

[scannillo]

When switching back to the Demo app, neither UIApplicationDelegate.application(_:didFinishLaunchingWithOptions:) nor UISceneDelegate.scene(_:openURLContexts:) gets triggered. This is a problem since our SDK will need to receive the returnURL from the universal link switch into the Demo app.

Maybe there's an additional piece we need to configure 🤔

[scannillo]

Non-blocking ❓, but I'm curious what App/SceneDelegate method gets invoked if the merchant app is in the "not running" state - for example if a user kills the merchant app after they've switched to PayPal

[jaxdesmarais]

Non-blocking ❓, but I'm curious what App/SceneDelegate method gets invoked if the merchant app is in the "not running" state - for example if a user kills the merchant app after they've switched to PayPal

That's a great question, I just tested this with the Venmo flow and it looks like applicationWillTerminate is called if I kill the BT Demo in the middle of the Venmo flow.