[PM-18028] Enabling automatic tax for customers without country or with manual tax rates set (#5376)

src/Core/Billing/Extensions/SubscriptionCreateOptionsExtensions.cs

@@ -0,0 +1,26 @@
+using Stripe;
+
+namespace Bit.Core.Billing.Extensions;
+
+public static class SubscriptionCreateOptionsExtensions
+{
+    /// <summary>
+    /// Attempts to enable automatic tax for given new subscription options.
+    /// </summary>
+    /// <param name="options"></param>
+    /// <param name="customer">The existing customer.</param>
+    /// <returns>Returns true when successful, false when conditions are not met.</returns>
+    public static bool EnableAutomaticTax(this SubscriptionCreateOptions options, Customer customer)
+    {
+        // We might only need to check the automatic tax status.
+        if (!customer.HasTaxLocationVerified() && string.IsNullOrWhiteSpace(customer.Address?.Country))
+        {
+            return false;
+        }
+
+        options.DefaultTaxRates = [];
+        options.AutomaticTax = new SubscriptionAutomaticTaxOptions { Enabled = true };
+
+        return true;
+    }
+}