Inconsistent behaviour regarding postal code validation on iOS and Android

[remonh87]

Describe the bug
Payment was made with an incorrect postal code format for Canada on the paymentsheet.

To Reproduce
Steps to reproduce the behavior:

Click the «Pay» button
Enter «Test» on the Name field
Enter «4242424242424242» on the Card number field
Enter «12/24»
Enter «242» CVC
Choose Canada Country
Enter «XYZ» on the Postal code
Expected behavior
Payment declined. An error is displayed

Smartphone / tablet

Device: iPhone X
OS: iOS 16.6
Package version: 9.2.2
Flutter version 3.10.5

On Android we get a payment declined

[charliecruzan-stripe]

Transferring from the stripe-react-native repo: this correlates to v23.12.0 (most recent version)

[davidme-stripe]

Thanks for filing this. We only validate ZIP codes in the US at the moment, but we'll add support for Canadian postal codes to match Android's behavior.