Implemented payloads pathfinding option (#24)

Author: DominiqueBlomsma

src/XUMM.NET.SDK.Tests/Data/payload-cancel.json

@@ -8,6 +8,7 @@
     "uuid": "00000000-0000-4839-af2f-f794874a80b0",
     "multisign": false,
     "submit": false,
+    "pathfinding": true,
     "destination": "",
     "resolved_destination": "",
     "resolved": false,

src/XUMM.NET.SDK.Tests/Data/payload-get.json

@@ -4,6 +4,7 @@
     "uuid": "00000000-0000-4839-af2f-f794874a80b0",
     "multisign": false,
     "submit": false,
+    "pathfinding": null,
     "destination": "",
     "resolved_destination": "",
     "resolved": true,

src/XUMM.NET.SDK.Tests/Fixtures/PayloadFixtures.cs

@@ -38,6 +38,7 @@ internal static class PayloadFixtures
             Uuid = "00000000-0000-4839-af2f-f794874a80b0",
             Multisign = false,
             Submit = false,
+            Pathfinding = null,
             Destination = string.Empty,
             ResolvedDestination = string.Empty,
             Resolved = true,
@@ -107,6 +108,7 @@ internal static class PayloadFixtures
             Uuid = "00000000-0000-4839-af2f-f794874a80b0",
             Multisign = false,
             Submit = false,
+            Pathfinding = true,
             Destination = string.Empty,
             ResolvedDestination = string.Empty,
             Resolved = false,

src/XUMM.NET.SDK/Models/Payload/XummPayloadDetailsMeta.cs

@@ -16,6 +16,9 @@ public class XummPayloadDetailsMeta
     [JsonPropertyName("submit")]
     public bool Submit { get; set; }
 
+    [JsonPropertyName("pathfinding")]
+    public bool? Pathfinding { get; set; }
+
     [JsonPropertyName("destination")]
     public string Destination { get; set; } = default!;
 

src/XUMM.NET.SDK/Models/Payload/XummPayloadOptions.cs

@@ -10,6 +10,12 @@ public class XummPayloadOptions
     [JsonPropertyName("submit")]
     public bool? Submit { get; set; }
 
+    /// <summary>
+    /// Allow pathfinding for regular Payment type transactions, so the user can select the asset to send to deliver the requested asset amount.
+    /// </summary>
+    [JsonPropertyName("pathfinding")]
+    public bool? Pathfinding { get; set; }
+
     /// <summary>
     /// Should the transaction be signed as a multi sign transaction? (Optional)
     /// </summary>