diff --git a/Cargo.lock b/Cargo.lock
index a5189b6..3f69a20 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1668,6 +1668,7 @@ dependencies = [
  "serde",
  "serde_json",
  "tokio",
+ "url",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 31ff702..517d023 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,3 +17,4 @@ reqwest = { version = "0.12.5", features = ["json"] }
 serde = { version = "1.0.204", features = ["derive"] }
 serde_json = "1.0.120"
 tokio = { version = "1.38.0", features = ["full"] }
+url = "2.5.2"
diff --git a/src/client.rs b/src/client.rs
index bcbf697..0a52011 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -79,7 +79,9 @@ impl Client {
         }
     }
 
-    pub async fn get_upload_token(&self) -> anyhow::Result<types::response::GetFileLinkTokenResponse> {
+    pub async fn get_upload_token(
+        &self,
+    ) -> anyhow::Result<types::response::GetFileLinkTokenResponse> {
         if self.last_refresh.read().await.elapsed().as_secs() > self.token_valid_time.into() {
             self.refresh_token().await?;
         }
@@ -162,12 +164,10 @@ impl Client {
 
         match serde_json::from_str(&text) {
             std::result::Result::Ok(json) => Ok(json),
-            Err(err) => {
-                match serde_json::from_str::<types::response::SendyError>(&text) {
-                    std::result::Result::Ok(json) => Err(anyhow::anyhow!("{:?}", json)),
-                    Err(_) => Err(anyhow::Error::new(err).context(text.trim().to_string())),
-                }
-            }
+            Err(err) => match serde_json::from_str::<types::response::SendyError>(&text) {
+                std::result::Result::Ok(json) => Err(anyhow::anyhow!("{:?}", json)),
+                Err(_) => Err(anyhow::Error::new(err).context(text.trim().to_string())),
+            },
         }
     }
 
@@ -302,6 +302,39 @@ pub async fn refresh_token(
     //     .map_err(Into::into)
 }
 
+pub async fn rid_token_auth(rid_code: &str) -> anyhow::Result<types::response::RIDTokenResponse> {
+    let client = reqwest::Client::new();
+    let request = client
+        .get(format!("https://www.rakuten-drive.com/api/v1/auth/rd/custom/token?rid_code={}&is_extension=false", rid_code))
+        .send()
+        .await?;
+
+    let text = request.text().await?;
+
+    let json: types::response::RIDTokenResponse = serde_json::from_str(&text)?;
+    Ok(json)
+}
+
+pub async fn get_refresh_token(
+    token: &str,
+) -> anyhow::Result<types::response::VerifyCustomTokenResponse> {
+    let client = reqwest::Client::new();
+    let req = types::request::VerifyCustomTokenRequest {
+        token: token.to_string(),
+        return_secure_token: true,
+    };
+    let request = client
+        .post("https://www.googleapis.com/identitytoolkit/v3/relyingparty/verifyCustomToken?key=AIzaSyDyp5IGr4nXbYin_oduNGi6ci-AnWcuAYE")
+        .json(&req)
+        .send()
+        .await?;
+
+    let text = request.text().await?;
+
+    let json: types::response::VerifyCustomTokenResponse = serde_json::from_str(&text)?;
+    Ok(json)
+}
+
 // https://www.rakuten-drive.com/api/account/refreshtoken POST RefreshTokenRequest RefreshTokenResponse
 // https://forest.sendy.jp/cloud/service/file/v1/file POST FileDetailRequest FileDetailResponse
 // https://forest.sendy.jp/cloud/service/file/v1/files POST ListFilesRequest ListFilesResponse
diff --git a/src/main.rs b/src/main.rs
index 6e9fb2d..6e26073 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,6 +106,7 @@ enum Commands {
     },
     #[clap(about = "Print file detail")]
     Info { path: String },
+    Auth {},
 }
 
 #[tokio::main]
@@ -140,8 +141,8 @@ async fn main() -> anyhow::Result<()> {
         Commands::Mkdir { name, path } => {
             client.mkdir(name, path.as_deref()).await.unwrap();
         }
-        Commands::Copy { src: _, dest: _ } => {
-            todo!("Copy");
+        Commands::Copy { src, dest } => {
+            client.copy(src, dest).await.unwrap();
         }
         Commands::Rename { path, name } => {
             client.rename(path, name).await.unwrap();
@@ -149,6 +150,29 @@ async fn main() -> anyhow::Result<()> {
         Commands::Info { path } => {
             client.info(path).await.unwrap();
         }
+        Commands::Auth {} => {
+            println!("Click the link below to authorize the app:\n");
+            let link = "https://login.account.rakuten.com/sso/authorize?response_type=code&client_id=rakuten_drive_web&redirect_uri=https://www.rakuten-drive.com/oauth-callback&scope=openid+profile+email&prompt=login&ui_locales=en";
+            println!("{}\n", link);
+
+            println!("Paste the URL you were redirected to:");
+            let mut auth_url = String::new();
+            std::io::stdin().read_line(&mut auth_url).unwrap();
+            let auth_url = url::Url::parse(auth_url.trim())?;
+
+            let params = auth_url.query_pairs().collect::<Vec<_>>();
+
+            let rid_code = params
+                .iter()
+                .find(|(key, _)| key == "code")
+                .map(|(_, value)| value.to_string())
+                .ok_or_else(|| anyhow::anyhow!("Code not found in URL"))?;
+
+            let rid_token_auth_res = client::rid_token_auth(rid_code.as_str()).await?;
+            let token_verify_res = client::get_refresh_token(&rid_token_auth_res.custom_token).await?;
+
+            println!("Refresh token: {}", token_verify_res.refresh_token);
+        }
     }
 
     Ok(())
diff --git a/src/types/request.rs b/src/types/request.rs
index d87800a..ffbec9c 100644
--- a/src/types/request.rs
+++ b/src/types/request.rs
@@ -151,4 +151,11 @@ pub struct CopyFileRequestFile {
     pub path: String,
     pub size: i64,
     pub version_id: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct VerifyCustomTokenRequest {
+    pub return_secure_token: bool,
+    pub token: String,
 }
\ No newline at end of file
diff --git a/src/types/response.rs b/src/types/response.rs
index 2393071..06de32f 100644
--- a/src/types/response.rs
+++ b/src/types/response.rs
@@ -176,3 +176,20 @@ pub enum SendyErrorType {
     SendyErrShareUpwardShareExist,
     SendyErrShareFolderIncludedOrInclude,
 }
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub struct RIDTokenResponse {
+    pub custom_token: String,
+    pub is_new_user: String, // "false"
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct VerifyCustomTokenResponse {
+    pub kind: String,
+    pub id_token: String,
+    pub refresh_token: String,
+    pub expires_in: String,
+    pub is_new_user: bool,
+}
\ No newline at end of file