diff --git a/libpaket/src/lib.rs b/libpaket/src/lib.rs
index 3181520..9455fd4 100644
--- a/libpaket/src/lib.rs
+++ b/libpaket/src/lib.rs
@@ -24,6 +24,10 @@ pub use advices::AdviceClient;
 #[cfg(feature = "unstable")]
 pub mod tracking;
 
+#[cfg(feature = "unstable")]
+#[cfg(feature = "locker_ble")]
+pub use locker::LockerClient;
+
 /*#[cfg(test)]
 pub(crate) mod private;*/
 
diff --git a/libpaket/src/locker/api.rs b/libpaket/src/locker/api.rs
index 27fd188..1d3fabe 100644
--- a/libpaket/src/locker/api.rs
+++ b/libpaket/src/locker/api.rs
@@ -1,14 +1,27 @@
-use reqwest::{header::HeaderMap, Request, RequestBuilder};
+use std::collections::HashMap;
 
-use crate::constants::{app_version, web_user_agent};
+use reqwest::header::HeaderMap;
 
-pub struct Client {
+use crate::{
+    constants::{app_version, web_user_agent},
+    locker::LockerServiceUUID,
+};
+
+use super::{crypto::CustomerKeySeed, LockerDevice};
+
+use serde::{self, Deserialize, Serialize};
+
+pub struct LockerClient {
     client: reqwest::Client,
 }
 
-impl Client {
-    pub fn new() -> Self {
-        Client {
+pub struct LockerSession {
+    api_client: reqwest::Client,
+}
+
+impl LockerClient {
+    pub async fn new() -> Self {
+        LockerClient {
             client: reqwest::ClientBuilder::new()
                 .default_headers(headers())
                 .user_agent(user_agent())
@@ -16,6 +29,21 @@ impl Client {
                 .unwrap(),
         }
     }
+
+    pub async fn open_session(
+        &self,
+        device: LockerDevice,
+        seed: &CustomerKeySeed,
+    ) -> LockerSession {
+        let request = LoginCustomerRequest {
+            device_id: seed.device_id.as_ref().unwrap().clone(),
+            firmware_version: todo!(),
+            postnumber: seed.postnumber.clone(),
+            signature: todo!(),
+            tlv_message: todo!(),
+            uuid: todo!(),
+        };
+    }
 }
 
 fn user_agent() -> String {
@@ -36,4 +64,66 @@ fn headers() -> HeaderMap {
     }
 
     map
-}
\ No newline at end of file
+}
+
+fn endpoint_auth_login_customer() -> &'static str {
+    "https://packstation.de/lpsAuth/auth/loginCustomer"
+}
+
+fn endpoint_service_session(locker_uuid: &str) -> String {
+    format!(
+        "https://packstation.de/lpsService/customer/v31/locker/{}/session",
+        locker_uuid
+    )
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LoginCustomerRequest {
+    device_id: String,
+    firmware_version: String,
+    postnumber: String,
+    signature: String,
+    tlv_message: String,
+    uuid: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LoginCustomerResponse {
+    access_token: String,
+    refresh_token: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LockerMetadata {
+    firmware_version: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Command {
+    lps_command_string: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct SessionRequest {
+    locker: LockerMetadata,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct LpsState {
+    open_compartments: Vec<u32>,
+    opened_compartments: Vec<u32>,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct SessionResponse {
+    lps_command_string: String,
+    lps_state: LpsState,
+    response_required: bool,
+}
diff --git a/libpaket/src/locker/types.rs b/libpaket/src/locker/types.rs
index 4a95ba4..615cdae 100644
--- a/libpaket/src/locker/types.rs
+++ b/libpaket/src/locker/types.rs
@@ -1,10 +1,9 @@
-use btleplug::platform::PeripheralId;
-
 use super::utils::PrimitiveReader;
 use crate::{LibraryError, LibraryResult};
 
 // 601e7028-0565-
 pub static LOCKER_SERVICE_UUID_PREFIX: (u32, u16) = (0x601e7028, 0x0565);
+pub static LOCKER_SERVICE_UUID: uuid::Uuid = uuid::Builder::from_fields(LOCKER_SERVICE_UUID_PREFIX.0, LOCKER_SERVICE_UUID_PREFIX.1, 0, &[0;8]).into_uuid();
 
 pub enum LockerVendor {
     Keba,
@@ -34,14 +33,12 @@ pub struct LockerVersion {
 
 #[derive(Debug)]
 pub struct LockerDevice {
-    pub id: PeripheralId,
     pub service_uuid: LockerServiceUUID,
     pub version: LockerVersion,
 }
 
 impl LockerDevice {
-    pub(crate) fn new(
-        id: PeripheralId,
+    pub fn new(
         service_uuid: LockerServiceUUID,
         service_data: &Vec<u8>,
     ) -> LibraryResult<Self> {
@@ -70,14 +67,13 @@ impl LockerDevice {
         println!("expected: {:?}", service_uuid);
 
         Ok(LockerDevice {
-            id,
             service_uuid,
             version,
         })
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone, Copy)]
 pub struct LockerServiceUUID {
     service_uuid: uuid::Uuid,
 }