Added files.

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/Generic/Operation.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Uralstech.UCloud.Operations.Generic
+{
+    /// <summary>
+    /// This resource represents a long-running operation that is the result of a network API call.
+    /// </summary>
+    /// <typeparam name="TMetadata">The type of the operation's metadata.</typeparam>
+    /// <typeparam name="TResponse">The type of the operation's response.</typeparam>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class Operation<TMetadata, TResponse>
+    {
+        /// <summary>
+        /// The server-assigned name, which is only unique within the same service that originally returns it.
+        /// </summary>
+        /// <remarks>
+        /// If you use the default HTTP mapping, the name should be a resource name ending with operations/{unique_id}.
+        /// </remarks>
+        public string Name;
+
+        /// <summary>
+        /// Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time.
+        /// </summary>
+        /// <remarks>
+        /// Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time.
+        /// </remarks>
+        public TMetadata Metadata = default;
+
+        /// <summary>
+        /// If the value is false, it means the operation is still in progress.
+        /// If true, the operation is completed, and either <see cref="Error"/> or <see cref="Response"/> is available.
+        /// </summary>
+        public bool Done;
+
+        /// <summary>
+        /// The error result of the operation in case of failure or cancellation.
+        /// </summary>
+        public OperationStatus Error = null;
+
+        /// <summary>
+        /// The normal response of the operation in case of success. If the original method returns no data on success, such as Delete, the response is google.protobuf.Empty.
+        /// </summary>
+        /// <remarks>
+        /// If the original method is standard Get/Create/Update, the response should be the resource. For other methods, the response should have the type XxxResponse,<br/>
+        /// where Xxx is the original method name. For example, if the original method name is TakeSnapshot(), the inferred response type is TakeSnapshotResponse.
+        /// </remarks>
+        public TResponse Response = default;
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/Get/OperationGetRequest.cs

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+namespace Uralstech.UCloud.Operations
+{
+    /// <summary>
+    /// Gets the latest state of a long-running operation. Clients can use this method to poll the operation result at intervals as recommended by the API service.
+    /// </summary>
+    /// <remarks>
+    /// Return type is <see cref="Operation"/> or <see cref="Generic.Operation{TMetadata, TResponse}"/>.
+    /// </remarks>
+    public class OperationGetRequest : IOperationsGetRequest
+    {
+        /// <summary>
+        /// The resource name of the operation to get.
+        /// </summary>
+        public string OperationName;
+
+        /// <inheritdoc/>
+        public string GetEndpointUri()
+        {
+            return $"https://servicemanagement.googleapis.com/v1/{OperationName}";
+        }
+
+        /// <summary>
+        /// Creates a new <see cref="OperationGetRequest"/>.
+        /// </summary>
+        /// <param name="operationName">The resource name of the operation to get.</param>
+        public OperationGetRequest(string operationName)
+        {
+            OperationName = operationName;
+        }
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/List/Generic/OperationsListResponse.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Uralstech.UCloud.Operations.Generic
+{
+    /// <summary>
+    /// The generic response for an <see cref="OperationsListRequest"/> call.
+    /// </summary>
+    /// <typeparam name="TMetadata">The type of the operation's metadata.</typeparam>
+    /// <typeparam name="TResponse">The type of the operation's response.</typeparam>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class OperationsListResponse<TMetadata, TResponse>
+    {
+        /// <summary>
+        /// A list of operations that matches the specified filter in the request.
+        /// </summary>
+        public Operation<TMetadata, TResponse>[] Operations;
+
+        /// <summary>
+        /// A token that can be sent as a <see cref="OperationsListRequest.PageToken"/> into a subsequent <see cref="OperationsListRequest"/> call.
+        /// </summary>
+        public string NextPageToken;
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/List/OperationsListRequest.cs

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+namespace Uralstech.UCloud.Operations
+{
+    /// <summary>
+    /// Requests metadata for an operation. Return type is <see cref="OperationsListResponse"/> or <see cref="Generic.OperationsListResponse{TMetadata, TResponse}"/>.
+    /// </summary>
+    public class OperationsListRequest : IOperationsGetRequest
+    {
+        /// <summary>
+        /// The maximum number of <see cref="Operation"/>s to return (per page).
+        /// </summary>
+        /// <remarks>
+        /// This method returns at most 100 operations per page.
+        /// </remarks>
+        public int MaxResponseOperations = 50;
+
+        /// <summary>
+        /// A page token from a previous <see cref="OperationsListRequest"/> call.
+        /// </summary>
+        public string PageToken = string.Empty;
+
+        /// <inheritdoc/>
+        public string GetEndpointUri()
+        {
+            return string.IsNullOrEmpty(PageToken)
+                ? $"https://servicemanagement.googleapis.com/v1/operations?pageSize={MaxResponseOperations}"
+                : $"https://servicemanagement.googleapis.com/v1/operations?pageSize={MaxResponseOperations}&pageToken={PageToken}";
+        }
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/List/OperationsListResponse.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Uralstech.UCloud.Operations
+{
+    /// <summary>
+    /// The response for an <see cref="OperationsListRequest"/> call.
+    /// </summary>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class OperationsListResponse
+    {
+        /// <summary>
+        /// A list of operations that matches the specified filter in the request.
+        /// </summary>
+        public Operation[] Operations;
+
+        /// <summary>
+        /// A token that can be sent as a <see cref="OperationsListRequest.PageToken"/> into a subsequent <see cref="OperationsListRequest"/> call.
+        /// </summary>
+        public string NextPageToken;
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/Operation.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Uralstech.UCloud.Operations
+{
+    /// <summary>
+    /// This resource represents a long-running operation that is the result of a network API call.
+    /// </summary>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class Operation : Generic.Operation<ProtobufObject, ProtobufObject> { }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/Operations/OperationStatus.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+
+namespace Uralstech.UCloud.Operations
+{
+    /// <summary>
+    /// The <see cref="OperationStatus"/> type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by gRPC.
+    /// </summary>
+    /// <remarks>
+    /// Each <see cref="OperationStatus"/> message contains three pieces of data: error code, error message, and error details.
+    /// </remarks>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class OperationStatus
+    {
+        /// <summary>
+        /// The status code, which should be an enum value of google.rpc.Code.
+        /// </summary>
+        public int Code;
+
+        /// <summary>
+        /// A developer-facing error message, which should be in English.
+        /// </summary>
+        /// <remarks>
+        /// Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
+        /// </remarks>
+        public string Message;
+
+        /// <summary>
+        /// A list of messages that carry the error details. There is a common set of message types for APIs to use.
+        /// </summary>
+        public ProtobufObject[] Details;
+    }
+}

UCloud.Operations/Packages/com.uralstech.ucloud.operations/Runtime/Scripts/Data/ProtobufObject.cs

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+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Newtonsoft.Json.Serialization;
+using System.Collections.Generic;
+
+namespace Uralstech.UCloud
+{
+    /// <summary>
+    /// An object containing fields of an arbitrary type.
+    /// </summary>
+    [JsonObject(NamingStrategyType = typeof(CamelCaseNamingStrategy))]
+    public class ProtobufObject
+    {
+        /// <summary>
+        /// Contains a URI identifying the type.
+        /// </summary>
+        [JsonProperty("@type")]
+        public string Type;
+
+        /// <summary>
+        /// The actual details of the <see cref="ProtobufObject"/> object.
+        /// </summary>
+        [JsonExtensionData]
+        public Dictionary<string, JToken> Data;
+    }
+}