First iteration for #8392

Description

Why

Please see the background in p1670855348591299/1670855146.255439-slack-C0354HSNUJH. I'm going with option 1 since I'm AFK soon, and don't want our app to be blocked from release. We can update the UX later after design confirmation.

Implementation

In StoreCreationCoordinator, it currently throws various PlanPurchaseErrors at the beginning after checking a series of IAP conditions:

Then in the catch closure, we currently show the M1 webview if there's an error. However, when we launch IAP with the storeCreationM2WithInAppPurchasesEnabled feature flag enabled, we can't fall back to the webview implementation. Therefore, I updated the error handling to show an alert if the storeCreationM2WithInAppPurchasesEnabled feature flag is enabled.

In order to not present the alert before the in-progress view is presented in case the result comes back immediately like when using a mock MockInAppPurchases, I updated the presentStoreCreation function to async to wait for the presentation completion.

Testing instructions

It's the easiest to test with a mock implementation using MockInAppPurchases.

IAP is not supported

• In code, change this line to return MockInAppPurchases(isIAPSupported: false). Also, in DefaultFeatureFlagService, return true for storeCreationM2WithInAppPurchasesEnabled feature flag
• Launch the app
• Log in if needed
• Go to the Menu tab, and tap Switch store
• On the store picker, tap + Add a store
• Tap Create a new store --> the in-progress view should be shown first. after a bit, an alert should be shown that indicates store creation isn't supported for the country

User is already entitled to the plan

• In code, change this line to return MockInAppPurchases(userIsEntitledToProduct: true). Also, in DefaultFeatureFlagService, return true for storeCreationM2WithInAppPurchasesEnabled feature flag
• Launch the app
• Log in if needed
• Go to the Menu tab, and tap Switch store
• On the store picker, tap + Add a store
• Tap Create a new store --> the in-progress view should be shown first. after a bit, an alert should be shown that indicates store creation isn't supported because their account is already associated with another store

Other errors, like product cannot be fetched

• In code, change this line to return MockInAppPurchases(products: []). Also, in DefaultFeatureFlagService, return true for storeCreationM2WithInAppPurchasesEnabled feature flag
• Launch the app
• Log in if needed
• Go to the Menu tab, and tap Switch store
• On the store picker, tap + Add a store
• Tap Create a new store --> the in-progress view should be shown first. after a bit, an alert should be shown that indicates store creation isn't supported in the app

• @jaclync tests with actual IAP following the testing guide in PdfdoF-1Ej-p2

Screenshots

Please feel free to suggest any improvements to the copy:

IAP not supported	user already purchased the plan	any other errors

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.