[PM-13999] Show estimated tax for taxable countries (#5077)

src/Api/Billing/Controllers/InvoicesController.cs

@@ -0,0 +1,42 @@
+using Bit.Core.AdminConsole.Entities;
+using Bit.Core.Billing.Models.Api.Requests.Organizations;
+using Bit.Core.Context;
+using Bit.Core.Repositories;
+using Bit.Core.Services;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Bit.Api.Billing.Controllers;
+
+[Route("invoices")]
+[Authorize("Application")]
+public class InvoicesController : BaseBillingController
+{
+    [HttpPost("preview-organization")]
+    public async Task<IResult> PreviewInvoiceAsync(
+        [FromBody] PreviewOrganizationInvoiceRequestBody model,
+        [FromServices] ICurrentContext currentContext,
+        [FromServices] IOrganizationRepository organizationRepository,
+        [FromServices] IPaymentService paymentService)
+    {
+        Organization organization = null;
+        if (model.OrganizationId != default)
+        {
+            if (!await currentContext.EditPaymentMethods(model.OrganizationId))
+            {
+                return Error.Unauthorized();
+            }
+
+            organization = await organizationRepository.GetByIdAsync(model.OrganizationId);
+            if (organization == null)
+            {
+                return Error.NotFound();
+            }
+        }
+
+        var invoice = await paymentService.PreviewInvoiceAsync(model, organization?.GatewayCustomerId,
+            organization?.GatewaySubscriptionId);
+
+        return TypedResults.Ok(invoice);
+    }
+}