GreenField: Add Invoice Payment methods endpoints

lets you fetch all active payment methods data + payments made

BTCPayServer.Client/Models/InvoicePaymentMethodDataModel.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using BTCPayServer.JsonConverters;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace BTCPayServer.Client.Models
+{
+    public class InvoicePaymentMethodDataModel
+    {
+        public string Destination { get; set; }
+        public string PaymentLink { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal Rate { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal PaymentMethodPaid { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal TotalPaid { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal Due { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal Amount { get; set; }
+
+        [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+        public decimal NetworkFee { get; set; }
+
+        public List<Payment> Payments { get; set; }
+        public string PaymentMethod { get; set; }
+
+        public class Payment
+        {
+            public string Id { get; set; }
+
+            [JsonConverter(typeof(NBitcoin.JsonConverters.DateTimeToUnixTimeConverter))]
+            public DateTime ReceivedDate { get; set; }
+
+            [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+            public decimal Value { get; set; }
+
+            [JsonProperty(ItemConverterType = typeof(NumericStringJsonConverter))]
+            public decimal Fee { get; set; }
+
+            [JsonConverter(typeof(StringEnumConverter))]
+            public PaymentStatus Status { get; set; }
+
+            public string Destination { get; set; }
+        
+        
+
+            public enum PaymentStatus
+            {
+                Invalid,
+                AwaitingConfirmation,
+                AwaitingCompletion,
+                Complete
+            }
+        }
+    }
+}