stub out BitPay IPN endpoint

src/Billing/BillingSettings.cs

@@ -5,6 +5,7 @@
         public virtual string JobsKey { get; set; }
         public virtual string StripeWebhookKey { get; set; }
         public virtual string StripeWebhookSecret { get; set; }
+        public virtual string BitPayWebhookKey { get; set; }
         public virtual PayPalSettings PayPal { get; set; } = new PayPalSettings();
 
         public class PayPalSettings

src/Billing/Controllers/BitPayController.cs

@@ -0,0 +1,68 @@
+using Bit.Core.Repositories;
+using Bit.Core.Services;
+using Bit.Core.Utilities;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Bit.Billing.Controllers
+{
+    [Route("bitpay")]
+    public class BitPayController : Controller
+    {
+        private readonly BillingSettings _billingSettings;
+        private readonly BitPayClient _bitPayClient;
+        private readonly ITransactionRepository _transactionRepository;
+        private readonly IOrganizationRepository _organizationRepository;
+        private readonly IUserRepository _userRepository;
+        private readonly IMailService _mailService;
+        private readonly IPaymentService _paymentService;
+
+        public BitPayController(
+            IOptions<BillingSettings> billingSettings,
+            BitPayClient bitPayClient,
+            ITransactionRepository transactionRepository,
+            IOrganizationRepository organizationRepository,
+            IUserRepository userRepository,
+            IMailService mailService,
+            IPaymentService paymentService)
+        {
+            _billingSettings = billingSettings?.Value;
+            _bitPayClient = bitPayClient;
+            _transactionRepository = transactionRepository;
+            _organizationRepository = organizationRepository;
+            _userRepository = userRepository;
+            _mailService = mailService;
+            _paymentService = paymentService;
+        }
+
+        [HttpPost("ipn")]
+        public async Task<IActionResult> PostIpn([FromQuery] string key)
+        {
+            if(key != _billingSettings.BitPayWebhookKey)
+            {
+                return new BadRequestResult();
+            }
+
+            if(HttpContext?.Request == null)
+            {
+                return new BadRequestResult();
+            }
+
+            string body = null;
+            using(var reader = new StreamReader(HttpContext.Request.Body, Encoding.UTF8))
+            {
+                body = await reader.ReadToEndAsync();
+            }
+
+            if(string.IsNullOrWhiteSpace(body))
+            {
+                return new BadRequestResult();
+            }
+
+            return new OkResult();
+        }
+    }
+}

src/Billing/appsettings.json

@@ -61,6 +61,7 @@
     "jobsKey": "SECRET",
     "stripeWebhookKey": "SECRET",
     "stripeWebhookSecret": "SECRET",
+    "bitPayWebhookKey": "SECRET",
     "payPal": {
       "production": false,
       "businessId": "AD3LAUZSNVPJY",