Payments Report: Add POS data columns

Extends the payments report data with subtotal, tip and discount amounts. This works for keypad and cart sales. Closes btcpayserver#5290.

BTCPayServer/Services/Reporting/PaymentsReportProvider.cs

@@ -44,7 +44,10 @@ ViewDefinition CreateViewDefinition()
  new ("LightningAddress", "string"),
  new ("Currency", "string"),
  new ("CurrencyAmount", "amount"),
- new ("Rate", "amount")
+ new ("Rate", "amount"),
+ new ("Subtotal", "amount"),
+ new ("Discount", "amount"),
+ new ("Tip", "amount")
  },
  Charts = 
  {
@@ -163,7 +166,7 @@ public override async Task Query(QueryContext queryContext, CancellationToken ca
  values.Add(paymentType.CryptoCode);
 
  var cryptoAmount = paymentData.GetValue();
-
+ var currency = invoiceBlob.Currency ?? "USD";
  var divisibility = 8;
  if (_btcPayNetworkProvider.TryGetNetwork<BTCPayNetwork>(paymentType.CryptoCode, out var network))
  {
@@ -180,15 +183,22 @@ public override async Task Query(QueryContext queryContext, CancellationToken ca
  values.Add(invoiceBlob.Currency);
  if (invoiceBlob.Rates.TryGetValue(paymentType.CryptoCode, out var rate))
  {
- values.Add(DisplayFormatter.ToFormattedAmount(rate * cryptoAmount, invoiceBlob.Currency ?? "USD")); // Currency amount
- values.Add(DisplayFormatter.ToFormattedAmount(rate, invoiceBlob.Currency ?? "USD"));
+ values.Add(DisplayFormatter.ToFormattedAmount(rate * cryptoAmount, currency)); // Currency amount
+ values.Add(DisplayFormatter.ToFormattedAmount(rate, currency));
  }
  else
  {
  values.Add(null);
  values.Add(null);
  }
 
+ var subtotal = invoiceBlob.Metadata.PosData.Value<decimal?>("subTotal");
+ values.Add(subtotal.HasValue ? DisplayFormatter.ToFormattedAmount(subtotal.Value, currency) : null);
+ var discount = invoiceBlob.Metadata.PosData.Value<decimal?>("discountAmount");
+ values.Add(discount.HasValue ? DisplayFormatter.ToFormattedAmount(discount.Value, currency) : null);
+ var tip = invoiceBlob.Metadata.PosData.Value<decimal?>("tip");
+ values.Add(tip.HasValue ? DisplayFormatter.ToFormattedAmount(tip.Value, currency) : null);
+
  queryContext.Data.Add(values);
  }
  }