Полный рефакторинг api. Вынесено отдельно api passport

YandexMusic.API/Requests/Passport/YCheckPhoneAvailabilityBuilder.cs

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+using System.Net;
+using System.Net.Http.Json;
+using YandexMusic.API.Models.Passport;
+
+namespace YandexMusic.API.Requests.Passport;
+
+internal class YCheckPhoneAvailabilityBuilder : YPassportRequestBuilder<YCheckAvailabilityResult?, string>
+{
+    public YCheckPhoneAvailabilityBuilder(YandexMusicApi api) : base(api) { }
+
+    protected override string Method => WebRequestMethods.Http.Post;
+    protected override string PathTemplate => "pwl-yandex/api/passport/suggest/check_availability";
+
+    protected override HttpContent? GetContent(string phone)
+    {
+        var data = new
+        {
+            track_id = Api.Storage.AuthToken.TrackId,
+            phone_number = phone,
+            can_use_anmon = true,
+            check_for_push = true,
+            push_suggest_log_all_subscriptions = false
+        };
+
+        return JsonContent.Create(data);
+    }
+}