Remove the feature flag

Signed-off-by: Cy Okeke <cokeke@bitwarden.com>

src/Core/Constants.cs

@@ -108,7 +108,6 @@ public static class FeatureFlagKeys
     public const string ItemShare = "item-share";
     public const string KeyRotationImprovements = "key-rotation-improvements";
     public const string DuoRedirect = "duo-redirect";
-    public const string PM5864DollarThreshold = "PM-5864-dollar-threshold";
     public const string ShowPaymentMethodWarningBanners = "show-payment-method-warning-banners";
     public const string AC2101UpdateTrialInitiationEmail = "AC-2101-update-trial-initiation-email";
     public const string EnableConsolidatedBilling = "enable-consolidated-billing";

src/Core/Services/Implementations/StripePaymentService.cs

@@ -715,19 +715,18 @@ public class StripePaymentService : IPaymentService
         var daysUntilDue = sub.DaysUntilDue;
         var chargeNow = collectionMethod == "charge_automatically";
         var updatedItemOptions = subscriptionUpdate.UpgradeItemsOptions(sub);
-        var isPm5864DollarThresholdEnabled = _featureService.IsEnabled(FeatureFlagKeys.PM5864DollarThreshold);
         var isAnnualPlan = sub?.Items?.Data.FirstOrDefault()?.Plan?.Interval == "year";
 
         var subUpdateOptions = new SubscriptionUpdateOptions
         {
             Items = updatedItemOptions,
-            ProrationBehavior = !isPm5864DollarThresholdEnabled || invoiceNow
+            ProrationBehavior = invoiceNow
             ? Constants.AlwaysInvoice
             : Constants.CreateProrations,
             DaysUntilDue = daysUntilDue ?? 1,
             CollectionMethod = "send_invoice"
         };
-        if (!invoiceNow && isAnnualPlan && isPm5864DollarThresholdEnabled && sub.Status.Trim() != "trialing")
+        if (!invoiceNow && isAnnualPlan && sub.Status.Trim() != "trialing")
         {
             subUpdateOptions.PendingInvoiceItemInterval =
                 new SubscriptionPendingInvoiceItemIntervalOptions { Interval = "month" };
@@ -761,7 +760,7 @@ public class StripePaymentService : IPaymentService
             {
                 try
                 {
-                    if (!isPm5864DollarThresholdEnabled && !invoiceNow)
+                    if (!invoiceNow)
                     {
                         if (chargeNow)
                         {