diff --git a/src/actors/openid_sessions_actor.rs b/src/actors/openid_sessions_actor.rs
index 9964147..b5aa546 100644
--- a/src/actors/openid_sessions_actor.rs
+++ b/src/actors/openid_sessions_actor.rs
@@ -45,10 +45,18 @@ pub struct PushNewSession(pub Session);
 #[rtype(result = "Option<Session>")]
 pub struct FindSessionByAuthorizationCode(pub String);
 
+#[derive(Message)]
+#[rtype(result = "Option<Session>")]
+pub struct FindSessionByRefreshToken(pub String);
+
 #[derive(Message)]
 #[rtype(result = "()")]
 pub struct MarkAuthorizationCodeUsed(pub String);
 
+#[derive(Message)]
+#[rtype(result = "()")]
+pub struct UpdateSession(pub Session);
+
 #[derive(Default)]
 pub struct OpenIDSessionsActor {
     session: Vec<Session>,
@@ -91,6 +99,17 @@ impl Handler<FindSessionByAuthorizationCode> for OpenIDSessionsActor {
     }
 }
 
+impl Handler<FindSessionByRefreshToken> for OpenIDSessionsActor {
+    type Result = Option<Session>;
+
+    fn handle(&mut self, msg: FindSessionByRefreshToken, _ctx: &mut Self::Context) -> Self::Result {
+        self.session
+            .iter()
+            .find(|f| f.refresh_token.eq(&msg.0))
+            .cloned()
+    }
+}
+
 impl Handler<MarkAuthorizationCodeUsed> for OpenIDSessionsActor {
     type Result = ();
 
@@ -101,4 +120,15 @@ impl Handler<MarkAuthorizationCodeUsed> for OpenIDSessionsActor {
             r.authorization_code_used = true;
         }
     }
+}
+
+impl Handler<UpdateSession> for OpenIDSessionsActor {
+    type Result = ();
+
+    fn handle(&mut self, msg: UpdateSession, _ctx: &mut Self::Context) -> Self::Result {
+        if let Some(r) = self.session.iter().enumerate()
+            .find(|f| f.1.session_id.eq(&msg.0.session_id)).map(|f| f.0) {
+            self.session[r] = msg.0;
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/controllers/openid_controller.rs b/src/controllers/openid_controller.rs
index 97c4e26..9a252b8 100644
--- a/src/controllers/openid_controller.rs
+++ b/src/controllers/openid_controller.rs
@@ -152,13 +152,29 @@ pub async fn authorize(user: CurrentUser, id: Identity, query: web::Query<Author
         ))).finish()
 }
 
+#[derive(Debug, serde::Deserialize)]
+pub struct TokenAuthorizationCodeQuery {
+    redirect_uri: String,
+    code: String,
+}
+
+#[derive(Debug, serde::Deserialize)]
+pub struct TokenRefreshTokenQuery {
+    refresh_token: String,
+}
+
+
 #[derive(Debug, serde::Deserialize)]
 pub struct TokenQuery {
     grant_type: String,
     client_id: Option<ClientID>,
     client_secret: Option<String>,
-    redirect_uri: String,
-    code: String,
+
+    #[serde(flatten)]
+    authorization_code_query: Option<TokenAuthorizationCodeQuery>,
+
+    #[serde(flatten)]
+    refresh_token_query: Option<TokenRefreshTokenQuery>,
 }
 
 #[derive(Debug, serde::Serialize)]
@@ -167,7 +183,8 @@ pub struct TokenResponse {
     token_type: &'static str,
     refresh_token: String,
     expires_in: u64,
-    id_token: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    id_token: Option<String>,
 }
 
 pub async fn token(req: HttpRequest,
@@ -176,8 +193,7 @@ pub async fn token(req: HttpRequest,
                    app_config: web::Data<AppConfig>,
                    sessions: web::Data<Addr<OpenIDSessionsActor>>,
                    jwt_signer: web::Data<JWTSigner>) -> actix_web::Result<HttpResponse> {
-    // TODO : add refresh tokens : https://openid.net/specs/openid-connect-core-1_0.html#RefreshTokens
-    // TODO : check auth challenge
+    // TODO : check auth challenge : https://oa.dnc.global/-fr-.html?page=unarticle&id_article=148&lang=fr
 
     // Extraction authentication information
     let authorization_header = req.headers().get("authorization");
@@ -226,68 +242,111 @@ pub async fn token(req: HttpRequest,
         return Ok(HttpResponse::Unauthorized().body("Client secret is invalid!"));
     }
 
-    if query.grant_type != "authorization_code" {
-        log::warn!("Token request failed: Grant type unsupported! {:#?}", query.0);
-        return Ok(HttpResponse::BadRequest().body("Grant type unsupported!"));
-    }
+    let token_response = match (query.grant_type.as_str(),
+                                &query.authorization_code_query,
+                                &query.refresh_token_query) {
+        ("authorization_code", Some(q), _) => {
+            let session: Session = match sessions
+                .send(openid_sessions_actor::FindSessionByAuthorizationCode(q.code.clone()))
+                .await.unwrap()
+            {
+                None => {
+                    log::warn!("Token request failed: Session not found! {:#?}", query.0);
+                    return Ok(HttpResponse::NotFound().body("Session not found!"));
+                }
+                Some(s) => s,
+            };
 
-    let session: Session = match sessions
-        .send(openid_sessions_actor::FindSessionByAuthorizationCode(query.code.clone()))
-        .await.unwrap()
-    {
-        None => {
-            log::warn!("Token request failed: Session not found! {:#?}", query.0);
-            return Ok(HttpResponse::NotFound().body("Session not found!"));
+            if session.client != client.id {
+                log::warn!("Token request failed: Client mismatch! {:#?}", query.0);
+                return Ok(HttpResponse::Unauthorized().body("Client mismatch!"));
+            }
+
+            if session.redirect_uri != q.redirect_uri {
+                log::warn!("Token request failed: Invalid redirect URI! {:#?}", query.0);
+                return Ok(HttpResponse::Unauthorized().body("Invalid redirect URI!"));
+            }
+
+            if session.authorization_code_expire_at < time() {
+                log::warn!("Token request failed: Authorization code expired! {:#?}", query.0);
+                return Ok(HttpResponse::Unauthorized().body("Authorization code expired!"));
+            }
+
+            if session.authorization_code_used {
+                log::warn!("Token request failed: Authorization already used! {:#?}", query.0);
+                return Ok(HttpResponse::Unauthorized().body("Authorization already used!"));
+            }
+
+            // Mark session as used
+            sessions.send(openid_sessions_actor::MarkAuthorizationCodeUsed(session.authorization_code))
+                .await.unwrap();
+
+
+            // Generate id token
+            let token = IdToken {
+                issuer: app_config.website_origin.to_string(),
+                subject_identifier: session.user,
+                audience: session.client.0.to_string(),
+                expiration_time: session.access_token_expire_at,
+                issued_at: time(),
+                auth_time: session.auth_time,
+                nonce: session.nonce,
+            };
+
+            TokenResponse {
+                access_token: session.access_token,
+                token_type: "Bearer",
+                refresh_token: session.refresh_token,
+                expires_in: session.access_token_expire_at - time(),
+                id_token: Some(jwt_signer.sign_token(token.to_jwt_claims())?),
+            }
         }
-        Some(s) => s,
-    };
 
-    if session.client != client.id {
-        log::warn!("Token request failed: Client mismatch! {:#?}", query.0);
-        return Ok(HttpResponse::Unauthorized().body("Client mismatch!"));
-    }
+        ("refresh_token", _, Some(q)) => {
+            let mut session: Session = match sessions
+                .send(openid_sessions_actor::FindSessionByRefreshToken(q.refresh_token.clone()))
+                .await.unwrap()
+            {
+                None => {
+                    log::warn!("Token refresh failed: Session not found! {:#?}", query.0);
+                    return Ok(HttpResponse::NotFound().body("Session not found!"));
+                }
+                Some(s) => s,
+            };
 
-    if session.redirect_uri != query.redirect_uri {
-        log::warn!("Token request failed: Invalid redirect URI! {:#?}", query.0);
-        return Ok(HttpResponse::Unauthorized().body("Invalid redirect URI!"));
-    }
+            if session.client != client.id {
+                log::warn!("Token request failed: Client mismatch! {:#?}", query.0);
+                return Ok(HttpResponse::Unauthorized().body("Client mismatch!"));
+            }
 
-    if session.authorization_code_expire_at < time() {
-        log::warn!("Token request failed: Authorization code expired! {:#?}", query.0);
-        return Ok(HttpResponse::Unauthorized().body("Authorization code expired!"));
-    }
+            session.refresh_token = rand_str(OPEN_ID_REFRESH_TOKEN_LEN);
+            session.refresh_token_expire_at = OPEN_ID_REFRESH_TOKEN_TIMEOUT + time();
+            session.access_token = rand_str(OPEN_ID_ACCESS_TOKEN_LEN);
+            session.access_token_expire_at = OPEN_ID_ACCESS_TOKEN_TIMEOUT + time();
 
-    if session.authorization_code_used {
-        log::warn!("Token request failed: Authorization already used! {:#?}", query.0);
-        return Ok(HttpResponse::Unauthorized().body("Authorization already used!"));
-    }
+            sessions
+                .send(openid_sessions_actor::UpdateSession(session.clone()))
+                .await.unwrap();
 
-    // Mark session as used
-    sessions.send(openid_sessions_actor::MarkAuthorizationCodeUsed(session.authorization_code))
-        .await.unwrap();
+            TokenResponse {
+                access_token: session.access_token,
+                token_type: "Bearer",
+                refresh_token: session.refresh_token,
+                expires_in: session.access_token_expire_at - time(),
+                id_token: None,
+            }
+        }
 
-
-    // Generate id token
-    let token = IdToken {
-        issuer: app_config.website_origin.to_string(),
-        subject_identifier: session.user,
-        audience: session.client.0.to_string(),
-        expiration_time: session.access_token_expire_at,
-        issued_at: time(),
-        auth_time: session.auth_time,
-        nonce: session.nonce,
+        _ => {
+            log::warn!("Token request failed: Grant type unsupported or incomplete! {:#?}", query.0);
+            return Ok(HttpResponse::BadRequest().body("Grant type unsupported!"));
+        }
     };
 
     Ok(HttpResponse::Ok()
         .append_header(("Cache-Control", "no-store"))
         .append_header(("Pragam", "no-cache"))
-        .json(TokenResponse {
-            access_token: session.access_token,
-            token_type: "Bearer",
-            refresh_token: session.refresh_token,
-            expires_in: session.access_token_expire_at - time(),
-            id_token: jwt_signer.sign_token(token.to_jwt_claims())?
-        }))
+        .json(token_response))
 }
 
 #[derive(serde::Serialize)]