Improve error reporting in create invoice page (#3065)

BTCPayServer/Controllers/InvoiceController.UI.cs

@@ -906,8 +906,11 @@ namespace BTCPayServer.Controllers
             }
             catch (BitpayHttpException ex)
             {
-                Logs.PayServer.LogError(ex, $"Invoice creation failed due to invalid currency {model.Currency}");
-                ModelState.TryAddModelError(nameof(model.Currency), "Please make sure you entered a valid currency symbol, a rate provider is configured in store settings, and your configured rate provider is both online and providing rates for your selected currency.");
+                this.TempData.SetStatusMessageModel(new StatusMessageModel()
+                {
+                    Severity = StatusMessageModel.StatusSeverity.Error,
+                    Message = ex.Message
+                });
                 return View(model);
             }
         }

BTCPayServer/Controllers/InvoiceController.cs

@@ -409,6 +409,11 @@ namespace BTCPayServer.Controllers
                             return null;
                         }
                     }
+                    else
+                    {
+                        var suffix = currentRateToCrypto?.EvaluatedRule is string s ? $" ({s})" : string.Empty;
+                        logs.Write($"{logPrefix} This payment method should be created only if the amount of this invoice is in proper range. However, we are unable to fetch the rate of those limits. {suffix}", InvoiceEventData.EventSeverity.Warning);
+                    }
                 }
 
 #pragma warning disable CS0618

BTCPayServer/Views/Shared/_StatusMessage.cshtml

@@ -1,4 +1,4 @@
-@{
+@{
     var parsedModel = TempData.GetStatusMessageModel();
 }
 
@@ -13,7 +13,7 @@
         }
         @if (!string.IsNullOrEmpty(parsedModel.Message))
         {
-            @parsedModel.Message
+            <span style="white-space: pre-wrap;">@parsedModel.Message</span>
         }
         @if (!string.IsNullOrEmpty(parsedModel.Html))
         {