Add payment unavailable support article link.

feature/registration/src/main/java/org/signal/registration/RegistrationNavigation.kt

@@ -743,6 +743,8 @@ private fun EntryProviderScope<NavKey>.navigationEntries(
       when (action) {
         SignalLoginPaymentScreenActions.OpenLearnMoreArticle -> openUrl(context, "https://support.signal.org/hc/articles/11197884108826")
 
+        SignalLoginPaymentScreenActions.OpenPaymentUnavailableArticle -> openUrl(context, "https://support.signal.org/hc/articles/11228705649690")
+
         is SignalLoginPaymentScreenActions.LaunchPurchaseFlow -> {
           purchaseScope.launch {
             val result = if (activity != null) {

feature/registration/src/main/java/org/signal/registration/screens/signalloginpayment/SignalLoginPaymentScreen.kt

@@ -272,7 +272,7 @@ private fun PaymentUnavailableDialog(
 ) {
   val onDismiss = { onEvent(SignalLoginPaymentScreenEvents.PaymentUnavailableDialogDismissed) }
   val onMakeAvailable = { onEvent(SignalLoginPaymentScreenEvents.MakeGooglePlayServicesAvailableClicked) }
-  val onLearnMore = { onEvent(SignalLoginPaymentScreenEvents.LearnMoreClicked) }
+  val onLearnMore = { onEvent(SignalLoginPaymentScreenEvents.PaymentUnavailableLearnMoreClicked) }
 
   val dialogModifier = Modifier.testTag(TestTags.SIGNAL_LOGIN_PAYMENT_UNAVAILABLE_DIALOG)
 

feature/registration/src/main/java/org/signal/registration/screens/signalloginpayment/SignalLoginPaymentScreenActions.kt

@@ -11,6 +11,9 @@ sealed interface SignalLoginPaymentScreenActions {
   /** Open the article explaining Signal Login. */
   data object OpenLearnMoreArticle : SignalLoginPaymentScreenActions
 
+  /** Open the article explaining why Google Play is required to buy a Signal Login. */
+  data object OpenPaymentUnavailableArticle : SignalLoginPaymentScreenActions
+
   /**
    * Launch the Google Play purchase sheet. The UI layer owns the activity, launches [launcher], and reports the
    * outcome back as [SignalLoginPaymentScreenEvents.PurchaseFlowCompleted].

feature/registration/src/main/java/org/signal/registration/screens/signalloginpayment/SignalLoginPaymentScreenEvents.kt

@@ -20,6 +20,9 @@ sealed class SignalLoginPaymentScreenEvents {
   /** The user tapped the "learn more" link in the description. */
   data object LearnMoreClicked : SignalLoginPaymentScreenEvents()
 
+  /** The user tapped "learn more" on the dialog explaining that Google Play cannot take a payment. */
+  data object PaymentUnavailableLearnMoreClicked : SignalLoginPaymentScreenEvents()
+
   /** The user selected one of the two options. */
   data class OptionSelected(val option: SignalLoginPaymentState.Option) : SignalLoginPaymentScreenEvents()
 

feature/registration/src/main/java/org/signal/registration/screens/signalloginpayment/SignalLoginPaymentViewModel.kt

@@ -145,6 +145,10 @@ class SignalLoginPaymentViewModel(
         _actions.trySend(SignalLoginPaymentScreenActions.OpenLearnMoreArticle)
       }
 
+      is SignalLoginPaymentScreenEvents.PaymentUnavailableLearnMoreClicked -> {
+        _actions.trySend(SignalLoginPaymentScreenActions.OpenPaymentUnavailableArticle)
+      }
+
       is SignalLoginPaymentScreenEvents.OptionSelected -> {
         if (event.option == SignalLoginPaymentState.Option.Purchase && !state.isPurchaseOptionEnabled) {
           Log.w(TAG, "[OptionSelected] Ignoring a purchase selection that cannot be acted on.")

feature/registration/src/test/java/org/signal/registration/screens/signalloginpayment/SignalLoginPaymentViewModelTest.kt

@@ -91,6 +91,15 @@ class SignalLoginPaymentViewModelTest {
     assertThat(actions).containsExactly(SignalLoginPaymentScreenActions.OpenLearnMoreArticle)
   }
 
+  @Test
+  fun `PaymentUnavailableLearnMoreClicked emits an action to open the payment unavailable article`() = runTest(testDispatcher) {
+    val actions = collectActions()
+
+    viewModel.applyEvent(SignalLoginPaymentState(), SignalLoginPaymentScreenEvents.PaymentUnavailableLearnMoreClicked, parentEventEmitter) {}
+
+    assertThat(actions).containsExactly(SignalLoginPaymentScreenActions.OpenPaymentUnavailableArticle)
+  }
+
   @Test
   fun `Initialize loads the price from the billing library`() = runTest(testDispatcher) {
     coEvery { mockRepository.getSignalLoginPrice() } returns SignalLoginPriceResult.Available("$1.99")