Update NBitcoin, fix warnings on nullable (#2718)

BTCPayServer.Client/BTCPayServer.Client.csproj

@@ -27,8 +27,8 @@
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>
     <ItemGroup>
-      <PackageReference Include="NBitcoin" Version="5.0.81" />
+      <PackageReference Include="NBitcoin" Version="6.0.4" />
-      <PackageReference Include="BTCPayServer.Lightning.Common" Version="1.2.0" />
+      <PackageReference Include="BTCPayServer.Lightning.Common" Version="1.2.4" />
       <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     </ItemGroup>
   <ItemGroup>

BTCPayServer.Common/BTCPayServer.Common.csproj

@@ -4,7 +4,7 @@
 
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <PackageReference Include="NBXplorer.Client" Version="3.0.21" />
+    <PackageReference Include="NBXplorer.Client" Version="4.0.0" />
   </ItemGroup>
   <ItemGroup Condition="'$(Altcoins)' != 'true'">
     <Compile Remove="Altcoins\**\*.cs"></Compile>

BTCPayServer.Rating/BTCPayServer.Rating.csproj

@@ -6,7 +6,7 @@
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.6.0" />
     <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />
-    <PackageReference Include="NBitcoin" Version="5.0.81" />
+    <PackageReference Include="NBitcoin" Version="6.0.4" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="DigitalRuby.ExchangeSharp" Version="0.6.3" />
   </ItemGroup>

BTCPayServer.Tests/GreenfieldAPITests.cs

@@ -1937,7 +1937,7 @@ namespace BTCPayServer.Tests
             }
 
             var methods = await adminClient.GetStorePaymentMethods(store.Id);
-            Assert.Equal(1, methods.Count);
+            Assert.Single(methods);
             VerifyLightning(methods);
             
             var randK = new Mnemonic(Wordlist.English, WordCount.Twelve).DeriveExtKey().Neuter().ToString(Network.RegTest);

BTCPayServer.Tests/PayJoinTests.cs

@@ -146,7 +146,7 @@ namespace BTCPayServer.Tests
         {
             var tx = network.NBitcoinNetwork.CreateTransaction();
             tx.Inputs.Add(new OutPoint(RandomUtils.GetUInt256(), 0), Script.Empty);
-            tx.Outputs.Add(Money.Coins(1.0m), new Key().ScriptPubKey);
+            tx.Outputs.Add(Money.Coins(1.0m), new Key().GetScriptPubKey(ScriptPubKeyType.Legacy));
             return tx;
         }
 
@@ -184,12 +184,16 @@ namespace BTCPayServer.Tests
 
                 foreach (ScriptPubKeyType senderAddressType in Enum.GetValues(typeof(ScriptPubKeyType)))
                 {
+                    if (senderAddressType == ScriptPubKeyType.TaprootBIP86)
+                        continue;
                     var senderUser = tester.NewAccount();
                     senderUser.GrantAccess(true);
                     senderUser.RegisterDerivationScheme("BTC", senderAddressType);
 
                     foreach (ScriptPubKeyType receiverAddressType in Enum.GetValues(typeof(ScriptPubKeyType)))
                     {
+                        if (receiverAddressType == ScriptPubKeyType.TaprootBIP86)
+                            continue;
                         var senderCoin = await senderUser.ReceiveUTXO(Money.Satoshis(100000), network);
 
                         Logs.Tester.LogInformation($"Testing payjoin with sender: {senderAddressType} receiver: {receiverAddressType}");

BTCPayServer.Tests/UnitTest1.cs

@@ -1689,7 +1689,10 @@ namespace BTCPayServer.Tests
                 var invoice2Address =
                     BitcoinAddress.Create(invoice2.BitcoinAddress, user.SupportedNetwork.NBitcoinNetwork);
                 uint256 invoice2tx1Id =
-                    await tester.ExplorerNode.SendToAddressAsync(invoice2Address, invoice2.BtcDue, replaceable: true);
+                    await tester.ExplorerNode.SendToAddressAsync(invoice2Address, invoice2.BtcDue, new NBitcoin.RPC.SendToAddressParameters()
+                    {
+                        Replaceable = true
+                    });
                 Transaction invoice2Tx1 = null;
                 TestUtils.Eventually(() =>
                 {
@@ -1707,7 +1710,7 @@ namespace BTCPayServer.Tests
                 output = invoice2Tx2.Outputs.First(o =>
                     o.ScriptPubKey == invoice2Address.ScriptPubKey);
                 output.Value -= new Money(10_000, MoneyUnit.Satoshi);
-                output.ScriptPubKey = new Key().ScriptPubKey;
+                output.ScriptPubKey = new Key().GetScriptPubKey(ScriptPubKeyType.Legacy);
                 invoice2Tx2 = await tester.ExplorerNode.SignRawTransactionAsync(invoice2Tx2);
                 await tester.ExplorerNode.SendRawTransactionAsync(invoice2Tx2);
                 tester.ExplorerNode.Generate(1);

BTCPayServer.Tests/docker-compose.altcoins.yml

@@ -84,7 +84,7 @@ services:
       - customer_lnd
       - merchant_lnd
   nbxplorer:
-    image: nicolasdorier/nbxplorer:2.1.49
+    image: nicolasdorier/nbxplorer:2.1.53
     restart: unless-stopped
     ports:
       - "32838:32838"

BTCPayServer.Tests/docker-compose.yml

@@ -81,7 +81,7 @@ services:
       - customer_lnd
       - merchant_lnd
   nbxplorer:
-    image: nicolasdorier/nbxplorer:2.1.49
+    image: nicolasdorier/nbxplorer:2.1.53
     restart: unless-stopped
     ports:
       - "32838:32838"

BTCPayServer/BTCPayServer.csproj

@@ -46,7 +46,7 @@
   <ItemGroup>
     <PackageReference Include="BIP78.Sender" Version="0.2.0" />
     <PackageReference Include="BTCPayServer.Hwi" Version="2.0.1" />
-    <PackageReference Include="BTCPayServer.Lightning.All" Version="1.2.7" />
+    <PackageReference Include="BTCPayServer.Lightning.All" Version="1.2.9" />
     <PackageReference Include="BuildBundlerMinifier" Version="3.2.449" />
     <PackageReference Include="BundlerMinifier.Core" Version="3.2.435" />
     <PackageReference Include="BundlerMinifier.TagHelpers" Version="3.2.435" />

BTCPayServer/Controllers/GreenField/LocalBTCPayServerClient.cs

@@ -504,11 +504,11 @@ namespace BTCPayServer.Controllers.GreenField
             return Task.FromResult(GetFromActionResult(_chainPaymentMethodsController.GetOnChainPaymentMethods(storeId, enabled)));
         }
 
-        public override async Task<OnChainPaymentMethodData> GetStoreOnChainPaymentMethod(string storeId,
+        public override Task<OnChainPaymentMethodData> GetStoreOnChainPaymentMethod(string storeId,
             string cryptoCode, CancellationToken token = default)
         {
-            return GetFromActionResult(
+            return Task.FromResult(GetFromActionResult(
-                await _chainPaymentMethodsController.GetOnChainPaymentMethod(storeId, cryptoCode));
+                _chainPaymentMethodsController.GetOnChainPaymentMethod(storeId, cryptoCode)));
         }
 
         public override async Task RemoveStoreOnChainPaymentMethod(string storeId, string cryptoCode,
@@ -534,13 +534,13 @@ namespace BTCPayServer.Controllers.GreenField
                     paymentMethod, offset, amount)));
         }
 
-        public override async Task<OnChainPaymentMethodPreviewResultData> PreviewStoreOnChainPaymentMethodAddresses(
+        public override Task<OnChainPaymentMethodPreviewResultData> PreviewStoreOnChainPaymentMethodAddresses(
             string storeId, string cryptoCode, int offset = 0, int amount = 10,
             CancellationToken token = default)
         {
-            return GetFromActionResult<OnChainPaymentMethodPreviewResultData>(
+            return Task.FromResult(GetFromActionResult<OnChainPaymentMethodPreviewResultData>(
-                await _chainPaymentMethodsController.GetOnChainPaymentMethodPreview(storeId, cryptoCode, offset,
+                    _chainPaymentMethodsController.GetOnChainPaymentMethodPreview(storeId, cryptoCode, offset,
-                    amount));
+                    amount)));
         }
 
         public override Task<ApiHealthData> GetHealth(CancellationToken token = default)

BTCPayServer/Controllers/GreenField/StoreLightningNetworkPaymentMethodsController.cs

@@ -1,5 +1,6 @@
 #nullable enable
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Threading.Tasks;
 using BTCPayServer.Abstractions.Constants;
@@ -122,7 +123,7 @@ namespace BTCPayServer.Controllers.GreenField
                 return NotFound();
             }
 
-            if (string.IsNullOrEmpty(paymentMethodData?.ConnectionString))
+            if (string.IsNullOrEmpty(paymentMethodData.ConnectionString))
             {
                 ModelState.AddModelError(nameof(LightningNetworkPaymentMethodData.ConnectionString),
                     "Missing connectionString");
@@ -131,8 +132,8 @@ namespace BTCPayServer.Controllers.GreenField
             if (!ModelState.IsValid)
                 return this.CreateValidationError(ModelState);
 
-            LightningSupportedPaymentMethod paymentMethod = null;
+            LightningSupportedPaymentMethod? paymentMethod = null;
-            if (!string.IsNullOrEmpty(paymentMethodData.ConnectionString))
+            if (!string.IsNullOrEmpty(paymentMethodData!.ConnectionString))
             {
                 if (paymentMethodData.ConnectionString == LightningSupportedPaymentMethod.InternalNode)
                 {
@@ -189,8 +190,8 @@ namespace BTCPayServer.Controllers.GreenField
             return Ok(GetExistingLightningLikePaymentMethod(cryptoCode, store));
         }
 
-        private LightningNetworkPaymentMethodData GetExistingLightningLikePaymentMethod(string cryptoCode,
+        private LightningNetworkPaymentMethodData? GetExistingLightningLikePaymentMethod(string cryptoCode,
-            StoreData store = null)
+            StoreData? store = null)
         {
             store ??= Store;
             var storeBlob = store.GetStoreBlob();
@@ -201,13 +202,13 @@ namespace BTCPayServer.Controllers.GreenField
                 .FirstOrDefault(method => method.PaymentId == id);
 
             var excluded = storeBlob.IsExcluded(id);
-            return paymentMethod == null
+            return paymentMethod is null
                 ? null
                 : new LightningNetworkPaymentMethodData(paymentMethod.PaymentId.CryptoCode,
                     paymentMethod.GetDisplayableConnectionString(), !excluded);
         }
 
-        private bool GetNetwork(string cryptoCode, out BTCPayNetwork network)
+        private bool GetNetwork(string cryptoCode, [MaybeNullWhen(false)] out BTCPayNetwork network)
         {
             network = _btcPayNetworkProvider.GetNetwork<BTCPayNetwork>(cryptoCode);
             network = network?.SupportLightning is true ? network : null;

BTCPayServer/Controllers/GreenField/StoreOnChainPaymentMethodsController.cs

@@ -73,7 +73,7 @@ namespace BTCPayServer.Controllers.GreenField
 
         [Authorize(Policy = Policies.CanViewStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Greenfield)]
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}")]
-        public async Task<ActionResult<OnChainPaymentMethodData>> GetOnChainPaymentMethod(
+        public ActionResult<OnChainPaymentMethodData> GetOnChainPaymentMethod(
             string storeId,
             string cryptoCode)
         {
@@ -93,7 +93,7 @@ namespace BTCPayServer.Controllers.GreenField
 
         [Authorize(Policy = Policies.CanViewStoreSettings, AuthenticationSchemes = AuthenticationSchemes.Greenfield)]
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/preview")]
-        public async Task<IActionResult> GetOnChainPaymentMethodPreview(
+        public IActionResult GetOnChainPaymentMethodPreview(
             string storeId,
             string cryptoCode,
             int offset = 0, int amount = 10)

BTCPayServer/Controllers/GreenField/StoreOnChainWalletsController.cs

@@ -1,6 +1,7 @@
 #nullable enable
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
 using System.Threading;
@@ -83,8 +84,8 @@ namespace BTCPayServer.Controllers.GreenField
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/wallet")]
         public async Task<IActionResult> ShowOnChainWalletOverview(string storeId, string cryptoCode)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var wallet = _btcPayWalletProvider.GetWallet(network);
             var balance = await wallet.GetBalance(derivationScheme.AccountDerivation);
@@ -102,8 +103,8 @@ namespace BTCPayServer.Controllers.GreenField
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/wallet/feerate")]
         public async Task<IActionResult> GetOnChainFeeRate(string storeId, string cryptoCode, int? blockTarget = null)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var feeRateTarget = blockTarget?? Store.GetStoreBlob().RecommendedFeeBlockTarget;
             return Ok(new OnChainWalletFeeRateData()
@@ -117,8 +118,8 @@ namespace BTCPayServer.Controllers.GreenField
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/wallet/address")]
         public async Task<IActionResult> GetOnChainWalletReceiveAddress(string storeId, string cryptoCode, bool forceGenerate = false)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var kpi = await _walletReceiveService.GetOrGenerate(new WalletId(storeId, cryptoCode), forceGenerate);
             if (kpi is null)
@@ -145,8 +146,8 @@ namespace BTCPayServer.Controllers.GreenField
         [HttpDelete("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/wallet/address")]
         public async Task<IActionResult> UnReserveOnChainWalletReceiveAddress(string storeId, string cryptoCode)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var addr = await _walletReceiveService.UnReserveAddress(new WalletId(storeId, cryptoCode));
             if (addr is null)
@@ -166,8 +167,8 @@ namespace BTCPayServer.Controllers.GreenField
             [FromQuery] int limit = int.MaxValue
         )
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var wallet = _btcPayWalletProvider.GetWallet(network);
             var walletId = new WalletId(storeId, cryptoCode);
@@ -203,8 +204,8 @@ namespace BTCPayServer.Controllers.GreenField
         public async Task<IActionResult> GetOnChainWalletTransaction(string storeId, string cryptoCode,
             string transactionId)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var wallet = _btcPayWalletProvider.GetWallet(network);
             var tx = await wallet.FetchTransaction(derivationScheme.AccountDerivation, uint256.Parse(transactionId));
@@ -225,8 +226,8 @@ namespace BTCPayServer.Controllers.GreenField
         [HttpGet("~/api/v1/stores/{storeId}/payment-methods/onchain/{cryptoCode}/wallet/utxos")]
         public async Task<IActionResult> GetOnChainWalletUTXOs(string storeId, string cryptoCode)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
 
             var wallet = _btcPayWalletProvider.GetWallet(network);
 
@@ -258,8 +259,8 @@ namespace BTCPayServer.Controllers.GreenField
         public async Task<IActionResult> CreateOnChainTransaction(string storeId, string cryptoCode,
             [FromBody] CreateOnChainTransactionRequest request)
         {
-            if (IsInvalidWalletRequest(cryptoCode, out BTCPayNetwork network,
+            if (IsInvalidWalletRequest(cryptoCode, out var network,
-                out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)) return actionResult;
+                out var derivationScheme, out var actionResult)) return actionResult;
             if (network.ReadonlyWallet)
             {
                 return this.CreateAPIError("not-available",
@@ -445,8 +446,13 @@ namespace BTCPayServer.Controllers.GreenField
             psbt.PSBT.RebaseKeyPaths(signingKeySettings.AccountKey, rootedKeyPath);
             var accountKey = signingKey.Derive(rootedKeyPath.KeyPath);
 
+            if (signingContext?.EnforceLowR is bool v)
+                psbt.PSBT.Settings.SigningOptions.EnforceLowR = v;
+            else if (psbt.Suggestions?.ShouldEnforceLowR is bool v2)
+                psbt.PSBT.Settings.SigningOptions.EnforceLowR = v2;
+
             var changed = psbt.PSBT.PSBTChanged(() => psbt.PSBT.SignAll(derivationScheme.AccountDerivation, accountKey,
-                rootedKeyPath, new SigningOptions() {EnforceLowR = signingContext?.EnforceLowR is bool v ? v : psbt.Suggestions.ShouldEnforceLowR }));
+                rootedKeyPath));
 
             if (!changed)
             {
@@ -458,7 +464,7 @@ namespace BTCPayServer.Controllers.GreenField
             var transaction = psbt.PSBT.ExtractTransaction();
             var transactionHash = transaction.GetHash();
             BroadcastResult broadcastResult;
-            if (!string.IsNullOrEmpty(signingContext.PayJoinBIP21))
+            if (!string.IsNullOrEmpty(signingContext?.PayJoinBIP21))
             {
                 signingContext.OriginalPSBT = psbt.PSBT.ToBase64();
                 try
@@ -468,8 +474,8 @@ namespace BTCPayServer.Controllers.GreenField
                     var payjoinPSBT = await _payjoinClient.RequestPayjoin(
                         new BitcoinUrlBuilder(signingContext.PayJoinBIP21, network.NBitcoinNetwork), new PayjoinWallet(derivationScheme),
                         psbt.PSBT, CancellationToken.None);
-                    payjoinPSBT = psbt.PSBT.SignAll(derivationScheme.AccountDerivation, accountKey, rootedKeyPath,
+                    psbt.PSBT.Settings.SigningOptions = new SigningOptions() { EnforceLowR = !(signingContext?.EnforceLowR is false) };
-                        new SigningOptions() {EnforceLowR = !(signingContext?.EnforceLowR is false)});
+                    payjoinPSBT = psbt.PSBT.SignAll(derivationScheme.AccountDerivation, accountKey, rootedKeyPath);
                     payjoinPSBT.Finalize();
                     var payjoinTransaction = payjoinPSBT.ExtractTransaction();
                     var hash = payjoinTransaction.GetHash();
@@ -508,11 +514,10 @@ namespace BTCPayServer.Controllers.GreenField
             return await _authorizationService.CanUseHotWallet(await _settingsRepository.GetPolicies(), User);
         }
 
-        private bool IsInvalidWalletRequest(string cryptoCode, out BTCPayNetwork network,
+        private bool IsInvalidWalletRequest(string cryptoCode, [MaybeNullWhen(true)] out BTCPayNetwork network,
-            out DerivationSchemeSettings derivationScheme, out IActionResult actionResult)
+            [MaybeNullWhen(true)] out DerivationSchemeSettings derivationScheme, [MaybeNullWhen(false)] out IActionResult actionResult)
         {
             derivationScheme = null;
-            actionResult = null;
             network = _btcPayNetworkProvider.GetNetwork<BTCPayNetwork>(cryptoCode);
             if (network is null)
             {
@@ -535,6 +540,7 @@ namespace BTCPayServer.Controllers.GreenField
                 return true;
             }
 
+            actionResult = null;
             return false;
         }
 

BTCPayServer/Controllers/InvoiceController.UI.cs

@@ -440,9 +440,9 @@ namespace BTCPayServer.Controllers
         {
             //Keep compatibility with Bitpay
             invoiceId = invoiceId ?? id;
-            id = invoiceId;
             //
-
+            if (invoiceId is null)
+                return NotFound();
             var model = await GetInvoiceModel(invoiceId, paymentMethodId == null ? null : PaymentMethodId.Parse(paymentMethodId), lang);
             if (model == null)
                 return NotFound();
@@ -472,24 +472,24 @@ namespace BTCPayServer.Controllers
         {
             //Keep compatibility with Bitpay
             invoiceId = invoiceId ?? id;
-            id = invoiceId;
             //
-
+            if (invoiceId is null)
-            var model = await GetInvoiceModel(invoiceId, paymentMethodId == null ? null : PaymentMethodId.Parse(paymentMethodId), lang);
+                return NotFound();
+            var model = await GetInvoiceModel(invoiceId, paymentMethodId is null ? null : PaymentMethodId.Parse(paymentMethodId), lang);
             if (model == null)
                 return NotFound();
 
             return View(model);
         }
 
-        private async Task<PaymentModel?> GetInvoiceModel(string invoiceId, PaymentMethodId paymentMethodId, string? lang)
+        private async Task<PaymentModel?> GetInvoiceModel(string invoiceId, PaymentMethodId? paymentMethodId, string? lang)
         {
             var invoice = await _InvoiceRepository.GetInvoice(invoiceId);
             if (invoice == null)
                 return null;
             var store = await _StoreRepository.FindStore(invoice.StoreId);
             bool isDefaultPaymentId = false;
-            if (paymentMethodId == null)
+            if (paymentMethodId is null)
             {
                 paymentMethodId = store.GetDefaultPaymentId(_NetworkProvider);
                 isDefaultPaymentId = true;
@@ -846,6 +846,11 @@ namespace BTCPayServer.Controllers
                 ModelState.AddModelError(nameof(model.StoreId), "You need to configure the derivation scheme in order to create an invoice");
                 return View(model);
             }
+            if (model.Amount is null)
+            {
+                ModelState.AddModelError(nameof(model.Amount), "Thhe invoice amount can't be empty");
+                return View(model);
+            }
 
             try
             {
@@ -910,7 +915,7 @@ namespace BTCPayServer.Controllers
         public class InvoiceStateChangeModel
         {
             public bool NotFound { get; set; }
-            public string StatusString { get; set; }
+            public string? StatusString { get; set; }
         }
 
         private string GetUserId()
@@ -933,7 +938,7 @@ namespace BTCPayServer.Controllers
                     var jObject = JObject.Parse(posData);
                     foreach (var item in jObject)
                     {
-                        switch (item.Value.Type)
+                        switch (item.Value?.Type)
                         {
                             case JTokenType.Array:
                                 var items = item.Value.AsEnumerable().ToList();
@@ -945,6 +950,8 @@ namespace BTCPayServer.Controllers
                             case JTokenType.Object:
                                 result.TryAdd(item.Key, ParsePosData(item.Value.ToString()));
                                 break;
+                            case null:
+                                break;
                             default:
                                 result.TryAdd(item.Key, item.Value.ToString());
                                 break;

BTCPayServer/Controllers/WalletsController.PSBT.cs

@@ -335,13 +335,14 @@ namespace BTCPayServer.Controllers
                             derivationSchemeSettings, network, cancellationToken);
                         try
                         {
+                            proposedPayjoin.Settings.SigningOptions = new SigningOptions()
+                            {
+                                EnforceLowR = !(vm.SigningContext?.EnforceLowR is false)
+                            };
                             var extKey = ExtKey.Parse(vm.SigningKey, network.NBitcoinNetwork);
                             proposedPayjoin = proposedPayjoin.SignAll(derivationSchemeSettings.AccountDerivation,
                                 extKey,
-                                RootedKeyPath.Parse(vm.SigningKeyPath), new SigningOptions()
+                                RootedKeyPath.Parse(vm.SigningKeyPath));
-                                {
-                                    EnforceLowR = !(vm.SigningContext?.EnforceLowR is false)
-                                });
                             vm.SigningContext.PSBT = proposedPayjoin.ToBase64();
                             vm.SigningContext.OriginalPSBT = psbt.ToBase64();
                             proposedPayjoin.Finalize();

BTCPayServer/Controllers/WalletsController.cs

@@ -925,10 +925,11 @@ namespace BTCPayServer.Controllers
                 return View(nameof(SignWithSeed), viewModel);
             }
 
-            var changed = psbt.PSBTChanged( () => psbt.SignAll(settings.AccountDerivation, signingKey, rootedKeyPath, new SigningOptions()
+            psbt.Settings.SigningOptions = new SigningOptions()
             {
                 EnforceLowR = !(viewModel.SigningContext?.EnforceLowR is false)
-            }));
+            };
+            var changed = psbt.PSBTChanged( () => psbt.SignAll(settings.AccountDerivation, signingKey, rootedKeyPath));
             if (!changed)
             {
                 ModelState.AddModelError(nameof(viewModel.SeedOrKey), "Impossible to sign the transaction. Probable causes: Incorrect account key path in wallet settings or PSBT already signed.");

BTCPayServer/Data/Payouts/BitcoinLike/BitcoinLikePayoutHandler.cs

@@ -302,7 +302,9 @@ public class BitcoinLikePayoutHandler : IPayoutHandler
                 .ThenInclude(o => o.StoreData)
                 .Where(p => p.State == PayoutState.AwaitingPayment)
                 .Where(p => p.PaymentMethodId == paymentMethodId.ToString())
+#pragma warning disable CA1307 // Specify StringComparison
                 .Where(p => destination.Equals(p.Destination))
+#pragma warning restore CA1307 // Specify StringComparison
                 .ToListAsync();
             var payoutByDestination = payouts.ToDictionary(p => p.Destination);
 

BTCPayServer/DerivationSchemeParser.cs

@@ -47,7 +47,7 @@ namespace BTCPayServer
             if (str == null)
                 throw new ArgumentNullException(nameof(str));
             str = str.Trim();
-            var outputDescriptor = OutputDescriptor.Parse(str);
+            var outputDescriptor = OutputDescriptor.Parse(str, Network);
             switch(outputDescriptor)
             {
                 case OutputDescriptor.PK _:

BTCPayServer/HostedServices/WebhookNotificationManager.cs

@@ -270,7 +270,7 @@ namespace BTCPayServer.HostedServices
                             await Task.Delay(wait, CancellationToken);
                             ctx = await CreateRedeliveryRequest(originalDeliveryId);
                             // This may have changed
-                            if (!ctx.WebhookBlob.AutomaticRedelivery ||
+                            if (ctx is null || !ctx.WebhookBlob.AutomaticRedelivery ||
                                 !ShouldDeliver(ctx.WebhookEvent.Type, ctx.WebhookBlob))
                                 break;
                             result = await SendAndSaveDelivery(ctx);

BTCPayServer/Models/StoreViewModels/WebhooksViewModel.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 
 namespace BTCPayServer.Models.StoreViewModels
@@ -11,7 +10,7 @@ namespace BTCPayServer.Models.StoreViewModels
             public string Url { get; set; }
             public bool LastDeliverySuccessful { get; set; } = true;
             public DateTimeOffset? LastDeliveryTimeStamp { get; set; } = null;
-            public string? LastDeliveryErrorMessage { get; set; } = null;
+            public string LastDeliveryErrorMessage { get; set; } = null;
         }
         public WebhookViewModel[] Webhooks { get; set; }
     }

BTCPayServer/Payments/PayJoin/PayJoinEndpointController.cs

@@ -462,10 +462,11 @@ namespace BTCPayServer.Payments.PayJoin
                 var coin = selectedUtxo.AsCoin(derivationSchemeSettings.AccountDerivation);
                 signedInput.UpdateFromCoin(coin);
                 var privateKey = accountKey.Derive(selectedUtxo.KeyPath).PrivateKey;
-                signedInput.Sign(privateKey, new SigningOptions()
+                signedInput.PSBT.Settings.SigningOptions = new SigningOptions()
                 {
                     EnforceLowR = enforcedLowR
-                });
+                };
+                signedInput.Sign(privateKey);
                 signedInput.FinalizeInput();
                 newTx.Inputs[signedInput.Index].WitScript = newPsbt.Inputs[(int)signedInput.Index].FinalScriptWitness;
             }

BTCPayServer/Services/LanguageService.cs

@@ -83,7 +83,7 @@ namespace BTCPayServer.Services
                         acceptedLocales[locale] = qualityScore;
                     }
                 }
-                catch (System.FormatException e)
+                catch (System.FormatException)
                 {
                     // Can't use this piece, moving on...
                 }