diff --git a/src/allmende_payment_system/api/__init__.py b/src/allmende_payment_system/api/__init__.py
index 6fca777..3f0a390 100644
--- a/src/allmende_payment_system/api/__init__.py
+++ b/src/allmende_payment_system/api/__init__.py
@@ -10,8 +10,7 @@ templates = get_jinja_renderer()
 
 
 @root_router.get("/")
-async def landing_page(request: Request, user_info: UserDep, session: SessionDep):
-    user = ensure_user(user_info, session)
+async def landing_page(request: Request, user: UserDep, session: SessionDep):
     print(f"User {user.username} ({user.display_name}) accessed landing page")
     transactions = []
     for account in user.accounts:
diff --git a/src/allmende_payment_system/api/dependencies.py b/src/allmende_payment_system/api/dependencies.py
index 80a3b12..67cf694 100644
--- a/src/allmende_payment_system/api/dependencies.py
+++ b/src/allmende_payment_system/api/dependencies.py
@@ -4,22 +4,8 @@ from typing import Annotated
 from fastapi import Depends, HTTPException, Request
 from sqlalchemy.orm import Session
 
-from allmende_payment_system.database import SessionLocal
-
-
-async def get_user(request: Request) -> dict:
-
-    if username := os.environ.get("APS_username", None):
-        return {
-            "username": username,
-            "display_name": os.environ.get("APS_display_name", "Missing Display Name"),
-        }
-    if "ynh_user" not in request.headers:
-        raise HTTPException(status_code=401, detail="Missing ynh_user header")
-    return {"username": request.headers["ynh_user"]}
-
-
-UserDep = Annotated[dict, Depends(get_user)]
+from allmende_payment_system.database import SessionLocal, ensure_user
+from allmende_payment_system.models import User
 
 
 def get_session() -> Session:
@@ -31,3 +17,27 @@ def get_session() -> Session:
 
 
 SessionDep = Annotated[Session, Depends(get_session)]
+
+
+async def get_user(request: Request) -> dict:
+
+    if username := os.environ.get("APS_username", None):
+        return {
+            "username": username,
+            "display_name": os.environ.get("APS_display_name", "Missing Display Name"),
+        }
+    if "ynh_user" not in request.headers:
+        raise HTTPException(status_code=401, detail="Missing ynh_user header")
+
+    return {"username": request.headers["ynh_user"]}
+
+
+async def get_user_object(request: Request, session: SessionDep) -> User:
+
+    user_info = await get_user(request)
+    user = ensure_user(user_info, session)
+    request.state.user = user
+    return user
+
+
+UserDep = Annotated[dict, Depends(get_user_object)]
diff --git a/src/allmende_payment_system/app.py b/src/allmende_payment_system/app.py
index d7ae837..adcbbff 100644
--- a/src/allmende_payment_system/app.py
+++ b/src/allmende_payment_system/app.py
@@ -4,11 +4,11 @@ from fastapi import Depends, FastAPI
 from fastapi.staticfiles import StaticFiles
 
 from allmende_payment_system.api import root_router
-from allmende_payment_system.api.dependencies import get_user
+from allmende_payment_system.api.dependencies import get_user_object
 from allmende_payment_system.api.shop import shop_router
 
 locale.setlocale(locale.LC_ALL, "de_DE.UTF-8")
-app = FastAPI(dependencies=[Depends(get_user)])
+app = FastAPI(dependencies=[Depends(get_user_object)])
 
 
 app.mount(
diff --git a/src/allmende_payment_system/models.py b/src/allmende_payment_system/models.py
index 9400be1..3d19a8b 100644
--- a/src/allmende_payment_system/models.py
+++ b/src/allmende_payment_system/models.py
@@ -2,8 +2,15 @@ import datetime
 import decimal
 import typing
 
-from sqlalchemy import Column, ForeignKey, Numeric, Table
-from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+from sqlalchemy import Column, ForeignKey, Numeric, Table, select
+from sqlalchemy.exc import NoResultFound
+from sqlalchemy.orm import (
+    DeclarativeBase,
+    Mapped,
+    mapped_column,
+    object_session,
+    relationship,
+)
 
 TABLE_PREFIX = "aps_"
 
@@ -46,6 +53,20 @@ class User(Base):
     accounts: Mapped[list["Account"]] = relationship(
         "Account", secondary=user_account_association, back_populates="users"
     )
+    orders: Mapped[list["Order"]] = relationship("Order", back_populates="user")
+
+    @property
+    def shopping_cart(self):
+        for order in self.orders:
+            if order.account_id is None:
+                cart = order
+                break
+        else:
+            cart = Order(user=self)
+            session = object_session(self)
+            session.add(cart)
+
+        return cart
 
 
 class Area(Base):
@@ -81,6 +102,40 @@ class Product(Base):
     image_path: Mapped[str] = mapped_column(nullable=True)
 
 
+class Order(Base):
+    __tablename__ = TABLE_PREFIX + "order"
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    user_id: Mapped[int] = mapped_column(ForeignKey(TABLE_PREFIX + "user.id"))
+    user: Mapped[User] = relationship("User", back_populates="orders")
+
+    account_id: Mapped[int] = mapped_column(
+        ForeignKey(TABLE_PREFIX + "account.id"), nullable=True
+    )
+    account: Mapped[Account | None] = relationship("Account")
+
+    items: Mapped[list["OrderItem"]] = relationship(
+        "OrderItem", cascade="all, delete-orphan", back_populates="order"
+    )
+
+    @property
+    def is_in_shopping_cart(self):
+        return self.account is None
+
+
+class OrderItem(Base):
+    __tablename__ = TABLE_PREFIX + "order_item"
+    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
+    order_id: Mapped[int] = mapped_column(ForeignKey(TABLE_PREFIX + "order.id"))
+    order: Mapped[Order] = relationship("Order", back_populates="items")
+
+    product_id: Mapped[int] = mapped_column(ForeignKey(TABLE_PREFIX + "product.id"))
+    product: Mapped[Product] = relationship("Product")
+    quantity: Mapped[int] = mapped_column(nullable=False)
+    total_amount: Mapped[decimal.Decimal] = mapped_column(
+        Numeric(10, 2), nullable=False
+    )
+
+
 TransactionTypes = typing.Literal[
     "product",
     "deposit",
diff --git a/src/allmende_payment_system/templates/base.html.jinja b/src/allmende_payment_system/templates/base.html.jinja
index 2cf7801..466d7ac 100644
--- a/src/allmende_payment_system/templates/base.html.jinja
+++ b/src/allmende_payment_system/templates/base.html.jinja
@@ -40,6 +40,21 @@
                             </a>
                         </li>
                     </ul>
+
+                    <!-- Shopping Cart at Bottom -->
+                    <div class="mt-auto pt-3 border-top">
+                        <a href="/cart" class="btn btn-primary w-100 position-relative">
+                            <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" fill="currentColor" class="bi bi-cart3 me-2" viewBox="0 0 16 16">
+                                <path d="M0 1.5A.5.5 0 0 1 .5 1H2a.5.5 0 0 1 .485.379L2.89 3H14.5a.5.5 0 0 1 .49.598l-1 5a.5.5 0 0 1-.465.401l-9.397.472L4.415 11H13a.5.5 0 0 1 0 1H4a.5.5 0 0 1-.491-.408L2.01 3.607 1.61 2H.5a.5.5 0 0 1-.5-.5M3.102 4l.84 4.479 9.144-.459L13.89 4zM5 12a2 2 0 1 0 0 4 2 2 0 0 0 0-4m7 0a2 2 0 1 0 0 4 2 2 0 0 0 0-4m-7 1a1 1 0 1 1 0 2 1 1 0 0 1 0-2m7 0a1 1 0 1 1 0 2 1 1 0 0 1 0-2"/>
+                            </svg>
+                            Warenkorb
+                            <span class="position-absolute top-0 start-100 translate-middle badge rounded-pill bg-danger">
+                                {{ request.state.user.shopping_cart.items|length }}
+                                <span class="visually-hidden">Artikel im Warenkorb</span>
+                            </span>
+                        </a>
+                    </div>
+
                 </div>
             </div>
 
diff --git a/test/conftest.py b/test/conftest.py
index 95d8be6..71b3596 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,14 +1,38 @@
 import os
+from unittest import mock
 
 import pytest
 from fastapi.testclient import TestClient
-from sqlalchemy import create_engine
+from sqlalchemy import StaticPool, create_engine
 from sqlalchemy.orm import sessionmaker
 
+from allmende_payment_system.api.dependencies import get_session
 from allmende_payment_system.app import app
 from allmende_payment_system.models import Base
 
 
+def make_db():
+    engine = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)  # Create tables
+    return sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def make_in_memory_session():
+    db = make_db()
+    session = db()
+    try:
+        yield session
+    finally:
+        session.close()
+
+
+app.dependency_overrides[get_session] = make_in_memory_session
+
+
 @pytest.fixture(scope="session")
 def client():
     os.environ["APS_username"] = "test"
@@ -23,13 +47,5 @@ def unauthorized_client():
 
 @pytest.fixture
 def test_db():
-    engine = create_engine("sqlite:///:memory:")
-    Base.metadata.create_all(bind=engine)  # Create tables
-    TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
-
-    # Provide a session and the engine
-    db = TestingSessionLocal()
-    try:
-        yield db
-    finally:
-        db.close()
+    db = make_db()
+    return db()
diff --git a/test/test_auth.py b/test/test_auth.py
index b5d9625..eac0b3d 100644
--- a/test/test_auth.py
+++ b/test/test_auth.py
@@ -1,11 +1,11 @@
 from allmende_payment_system.models import Account
 
 
-def test_unauthorized_access(unauthorized_client):
+def test_unauthorized_access(unauthorized_client, test_db):
     response = unauthorized_client.get("/")
     assert response.status_code == 401
 
 
-def test_authorized_access(client):
+def test_authorized_access(client, test_db):
     response = client.get("/")
     assert response.status_code == 200
diff --git a/test/test_models.py b/test/test_models.py
index d5825e2..246986b 100644
--- a/test/test_models.py
+++ b/test/test_models.py
@@ -1,16 +1,28 @@
+import pytest
+
 from allmende_payment_system.models import Account, User
 
 
-def test_user_model(test_db):
+@pytest.fixture(scope="function")
+def test_user(test_db):
     user = User(username="test", display_name="Test User")
     test_db.add(user)
-    test_db.commit()
+    test_db.flush()
+    return user
 
-    assert user.id is not None
+
+def test_user_model(test_db, test_user):
+    assert test_user.id is not None
 
     account = Account(name="Test Account")
-    account.users.append(user)
+    account.users.append(test_user)
     test_db.add(account)
-    test_db.commit()
+    test_db.flush()
 
-    assert len(user.accounts) == 1
+    assert len(test_user.accounts) == 1
+
+
+def test_user_shopping_cart_new(test_db, test_user):
+    cart = test_user.shopping_cart
+
+    assert len(cart.items) == 0