[PM-18794] Allow provider payment method (#5500)

* Add PaymentSource to ProviderSubscriptionResponse

* Add UpdatePaymentMethod to ProviderBillingController

* Add GetTaxInformation to ProviderBillingController

* Add VerifyBankAccount to ProviderBillingController

* Add feature flag

src/Api/Billing/Controllers/ProviderBillingController.cs

@@ -1,5 +1,6 @@
 using Bit.Api.Billing.Models.Requests;
 using Bit.Api.Billing.Models.Responses;
+using Bit.Core;
 using Bit.Core.AdminConsole.Repositories;
 using Bit.Core.Billing.Models;
 using Bit.Core.Billing.Pricing;
@@ -20,6 +21,7 @@ namespace Bit.Api.Billing.Controllers;
 [Authorize("Application")]
 public class ProviderBillingController(
     ICurrentContext currentContext,
+    IFeatureService featureService,
     ILogger<BaseProviderController> logger,
     IPricingClient pricingClient,
     IProviderBillingService providerBillingService,
@@ -71,6 +73,65 @@ public class ProviderBillingController(
             "text/csv");
     }
 
+    [HttpPut("payment-method")]
+    public async Task<IResult> UpdatePaymentMethodAsync(
+        [FromRoute] Guid providerId,
+        [FromBody] UpdatePaymentMethodRequestBody requestBody)
+    {
+        var allowProviderPaymentMethod = featureService.IsEnabled(FeatureFlagKeys.PM18794_ProviderPaymentMethod);
+
+        if (!allowProviderPaymentMethod)
+        {
+            return TypedResults.NotFound();
+        }
+
+        var (provider, result) = await TryGetBillableProviderForAdminOperation(providerId);
+
+        if (provider == null)
+        {
+            return result;
+        }
+
+        var tokenizedPaymentSource = requestBody.PaymentSource.ToDomain();
+        var taxInformation = requestBody.TaxInformation.ToDomain();
+
+        await providerBillingService.UpdatePaymentMethod(
+            provider,
+            tokenizedPaymentSource,
+            taxInformation);
+
+        return TypedResults.Ok();
+    }
+
+    [HttpPost("payment-method/verify-bank-account")]
+    public async Task<IResult> VerifyBankAccountAsync(
+        [FromRoute] Guid providerId,
+        [FromBody] VerifyBankAccountRequestBody requestBody)
+    {
+        var allowProviderPaymentMethod = featureService.IsEnabled(FeatureFlagKeys.PM18794_ProviderPaymentMethod);
+
+        if (!allowProviderPaymentMethod)
+        {
+            return TypedResults.NotFound();
+        }
+
+        var (provider, result) = await TryGetBillableProviderForAdminOperation(providerId);
+
+        if (provider == null)
+        {
+            return result;
+        }
+
+        if (requestBody.DescriptorCode.Length != 6 || !requestBody.DescriptorCode.StartsWith("SM"))
+        {
+            return Error.BadRequest("Statement descriptor should be a 6-character value that starts with 'SM'");
+        }
+
+        await subscriberService.VerifyBankAccount(provider, requestBody.DescriptorCode);
+
+        return TypedResults.Ok();
+    }
+
     [HttpGet("subscription")]
     public async Task<IResult> GetSubscriptionAsync([FromRoute] Guid providerId)
     {
@@ -102,12 +163,32 @@ public class ProviderBillingController(
 
         var subscriptionSuspension = await GetSubscriptionSuspensionAsync(stripeAdapter, subscription);
 
+        var paymentSource = await subscriberService.GetPaymentSource(provider);
+
         var response = ProviderSubscriptionResponse.From(
             subscription,
             configuredProviderPlans,
             taxInformation,
             subscriptionSuspension,
-            provider);
+            provider,
+            paymentSource);
+
+        return TypedResults.Ok(response);
+    }
+
+    [HttpGet("tax-information")]
+    public async Task<IResult> GetTaxInformationAsync([FromRoute] Guid providerId)
+    {
+        var (provider, result) = await TryGetBillableProviderForAdminOperation(providerId);
+
+        if (provider == null)
+        {
+            return result;
+        }
+
+        var taxInformation = await subscriberService.GetTaxInformation(provider);
+
+        var response = TaxInformationResponse.From(taxInformation);
 
         return TypedResults.Ok(response);
     }