mgmt: Add async_approval_notification_channels property to client model

src/Auth0.ManagementApi/Models/Client/AsyncApprovalNotificationChannels.cs

@@ -0,0 +1,21 @@
+using System.Runtime.Serialization;
+
+namespace Auth0.ManagementApi.Models;
+
+/// <summary>
+/// Async approval notification channels for a client
+/// </summary>
+public enum AsyncApprovalNotificationChannels
+{
+    /// <summary>
+    /// Client uses Guardian Push notification channel with CIBA flow
+    /// </summary>
+    [EnumMember(Value = "guardian-push")]
+    GuardianPush,
+
+    /// <summary>
+    /// Client uses email notification channel with CIBA flow
+    /// </summary>
+    [EnumMember(Value = "email")]
+    Email
+}

src/Auth0.ManagementApi/Models/Client/ClientBase.cs

@@ -228,4 +228,10 @@ public abstract class ClientBase
     /// </summary>
     [JsonProperty("session_transfer")]
     public SessionTransfer? SessionTransfer { get; set; }
+
+    /// <summary>
+    /// Configure the notification channel(s) to use with the CIBA flow
+    /// </summary>
+    [JsonProperty("async_approval_notification_channels", ItemConverterType = typeof(StringEnumConverter))]
+    public AsyncApprovalNotificationChannels[]? AsyncApprovalNotificationChannels { get; set; }
 }