diff --git a/backend/account/apps.py b/backend/account/apps.py
index 2b08f1a..f613e58 100644
--- a/backend/account/apps.py
+++ b/backend/account/apps.py
@@ -1,6 +1,7 @@
 from django.apps import AppConfig
+from django.contrib.auth import get_user_model
 
 
 class AccountConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
-    name = 'account'
+    name = 'account'
\ No newline at end of file
diff --git a/backend/account/models.py b/backend/account/models.py
index faa6134..9228c5a 100644
--- a/backend/account/models.py
+++ b/backend/account/models.py
@@ -165,4 +165,10 @@ class CustomUser(SoftDeleteModel, AbstractUser):
         if save:
             self.save(update_fields=["email_verified", "email_verification_token", "email_verification_sent_at"])
         return True
+    
+    def get_anonymous_user():
+        """Return the singleton anonymous user."""
+        User = CustomUser
+        return User.objects.get(username="anonymous")
+        
 
diff --git a/backend/commerce/models.py b/backend/commerce/models.py
index 19343a7..8a189bd 100644
--- a/backend/commerce/models.py
+++ b/backend/commerce/models.py
@@ -89,7 +89,7 @@ class Carrier(models.Model):
 
     choice = models.CharField(max_length=20, choices=Role.choices, default=Role.STORE)
 
-    
+    # prodejce to přidá později
     zasilkovna = models.ForeignKey(
         'thirdparty.zasilkovna.Zasilkovna', on_delete=models.DO_NOTHING, null=True, blank=True, related_name="carriers"
     )
@@ -98,13 +98,6 @@ class Carrier(models.Model):
         return f"{self.name} ({self.base_price} Kč)"
     
     def save(self, *args, **kwargs):
-        
-        #zásilkovna instance je vytvořena
-        if self.choice == self.Role.ZASILKOVNA:
-            self.packeta = PacketaShipment.objects.create()
-
-        elif self.choice == self.Role.STORE:
-            self.packeta = None
 
         super().save(*args, **kwargs)
 
@@ -161,10 +154,6 @@ class Order(models.Model):
         max_length=20, choices=Status.choices, default=Status.PENDING
     )
 
-    user = models.ForeignKey(
-        settings.AUTH_USER_MODEL, related_name="orders", on_delete=models.CASCADE
-    )
-
     carrier = models.ForeignKey(
         Carrier, on_delete=models.CASCADE, null=True, blank=True, related_name="orders"
     )
@@ -179,6 +168,10 @@ class Order(models.Model):
     currency = models.CharField(max_length=10, default="CZK")
 
     # fakturační údaje (zkopírované z user profilu při objednávce)
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING, related_name="orders", null=True, blank=True
+    )
+
     first_name = models.CharField(max_length=100)
     last_name = models.CharField(max_length=100)
     email = models.EmailField()
@@ -218,10 +211,18 @@ class Order(models.Model):
 
             return total
 
-
+    def import_data_from_user(self):
+        """Import user data into order for billing purposes."""
+        self.first_name = self.user.first_name
+        self.last_name = self.user.last_name
+        self.email = self.user.email
+        self.phone = self.user.phone
+        self.address = f"{self.user.street} {self.user.street_number}"
+        self.city = self.user.city
+        self.postal_code = self.user.postal_code
+        self.country = self.user.country
 
     def save(self, *args, **kwargs):
-
         # Keep total_price always in sync with items and discount
         self.total_price = self.calculate_total_price()
         
@@ -255,4 +256,17 @@ class OrderItem(models.Model):
             return ValueError("Invalid discount code.")
 
     def __str__(self):
-        return f"{self.product.name} x{self.quantity}"
\ No newline at end of file
+        return f"{self.product.name} x{self.quantity}"
+    
+
+
+
+
+    class Returning_order(models.Model):
+        #FIXME: dodělat !!!
+        order = models.ForeignKey(Order, related_name="returning_orders", on_delete=models.CASCADE)
+        reason = models.TextField(blank=True)
+        created_at = models.DateTimeField(auto_now_add=True)
+
+        def __str__(self):
+            return f"Returning Order #{self.order.id} - {self.created_at.strftime('%Y-%m-%d')}"
\ No newline at end of file
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 97ed758..336fa4c 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -86,6 +86,8 @@ weasyprint #tvoření PDFek z html dokumentu + css styly
 
 faker #generates fake data for testing purposes
 
+zeep #SOAP tool
+
 ## -- api --
 stripe
 gopay
\ No newline at end of file
diff --git a/backend/thirdparty/gopay/models.py b/backend/thirdparty/gopay/models.py
index 88e96a3..ce548ab 100644
--- a/backend/thirdparty/gopay/models.py
+++ b/backend/thirdparty/gopay/models.py
@@ -8,7 +8,7 @@ from django.utils import timezone
 class GoPayPayment(models.Model):
 	# Optional user association
 	user = models.ForeignKey(
-		settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="gopay_payments"
+		settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING, null=True, blank=True, related_name="gopay_payments"
 	)
 
 	# External identifiers and core attributes
diff --git a/backend/thirdparty/stripe/models.py b/backend/thirdparty/stripe/models.py
index 61a83c1..7f31142 100644
--- a/backend/thirdparty/stripe/models.py
+++ b/backend/thirdparty/stripe/models.py
@@ -13,8 +13,10 @@ class Order(models.Model):
     amount = models.DecimalField(max_digits=10, decimal_places=2)
     currency = models.CharField(max_length=10, default="czk")
     status = models.CharField(max_length=20, choices=STATUS_CHOICES, default="pending")
+
     stripe_session_id = models.CharField(max_length=255, blank=True, null=True)
     stripe_payment_intent = models.CharField(max_length=255, blank=True, null=True)
+    
     created_at = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
diff --git a/backend/thirdparty/zasilkovna/client.py b/backend/thirdparty/zasilkovna/client.py
new file mode 100644
index 0000000..98f8305
--- /dev/null
+++ b/backend/thirdparty/zasilkovna/client.py
@@ -0,0 +1,174 @@
+from zeep import Client
+from zeep.exceptions import Fault
+
+import base64
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+WSDL_URL = os.getenv("PACKETA_WSDL_URL", "https://soap.api.packeta.com/api/soap-bugfix.wsdl")
+PACKETA_API_PASSWORD = os.getenv("PACKETA_API_PASSWORD")
+
+zeepZasClient = Client(wsdl=WSDL_URL)
+
+
+class PacketaAPI:
+    
+    # ---------- CREATE PACKET METHODS ----------
+
+    def create_packet(self, number: str, name: str, surname: str, email: str, phone: str,
+                     address_id: int, value: float, currency: str = "CZK",
+                     weight: float = 1.0, eshop: str = "MyEshop", send_email_to_customer: bool = False):
+        """
+        Jednoduché uložení balíku. Vrací packetId, pod kterým lze později tahat veškeré info.
+
+        Parametry:
+            number: číslo objednávky
+            name, surname, email, phone: údaje zákazníka
+            address_id: ID výdejního místa
+            value: cena/částka zásilky
+            currency: měna
+            weight: hmotnost balíku
+            eshop: název e-shopu
+            send_email_to_customer: jestli poslat potvrzovací email
+
+        Návrat:
+            dict: {
+                "packetId": str,
+                "number": str,
+                "email": str,
+                "phone": str,
+                "value": float,
+                "currency": str
+            }
+        """
+        attributes = {
+            "number": number,
+            "name": name,
+            "surname": surname,
+            "email": email,
+            "phone": phone,
+            "addressId": address_id,
+            "value": value,
+            "currency": currency,
+            "weight": weight,
+            "eshop": eshop,
+            "sendEmailToCustomer": send_email_to_customer
+        }
+
+        try:
+            # Použijeme createPacketClaimWithPassword, protože umožňuje ukládat email a telefon
+            result = zeepZasClient.service.createPacketClaimWithPassword(PACKETA_API_PASSWORD, attributes)
+            return result
+
+        except Fault as e:
+            logger.error(f"Packeta store_packet error: {e}")
+            raise Exception(f"Chyba při ukládání balíku: {e}")
+
+    # ---------- CANCEL SENDING FROM STORE PACKET METHODS ----------
+
+    def cancel_packet(self, packet_id: int):
+        """
+        Zrušení zásilky (pokud ještě nebyla fyzicky odevzdána).
+        packet_id = 1234567890
+        """
+        try:
+            zeepZasClient.service.cancelPacket(PACKETA_API_PASSWORD, packet_id)
+
+            return {"status": "ok", "message": f"Zásilka {packet_id} byla zrušena."}
+        
+        except Fault as e:
+            logger.error(f"Packeta cancelPacket error: {e}")
+            raise Exception(f"Chyba při rušení zásilky: {e}")
+
+
+    # ---------- INFO PACKET METHODS ----------
+
+    def packet_state_ready_to_pickup(self, packet_id: int):
+        """
+        Vrací datum do kdy je uložená zásilka.
+        """
+        try:
+            request = zeepZasClient.service.packetGetStoredUntil(PACKETA_API_PASSWORD, packet_id)
+            if request is None:
+                raise Exception(f"Zásilka {packet_id} nebyla ještě doručena.")
+            
+            else:
+                return request  # vrací datum do kdy je zásilka uložena
+            
+        except Fault as e:
+            logger.error(f"Packeta packetGetStoredUntil error: {e}")
+            raise Exception(f"Chyba při získávání data uložení zásilky: {e}")
+        
+    def get_packet_label_pdf(self, packet_id: int, format: str = "A6 on A6", offset: int = 0):
+        """
+        Získání PDF štítku k zásilce.
+
+        Parametry:
+            packet_id (int): ID zásilky (např. 1234567890)
+            format (str): jeden z formátů:
+                - "A6 on A6"
+                - "A7 on A7"
+                - "A6 on A4"
+                - "A7 on A4"
+                - "A8 on A8"
+            offset (int): pozice na stránce (0 = vlevo nahoře)
+
+        Návrat:
+            bytes: PDF soubor (base64 dekódovaný)
+        """
+        try:
+            pdf_base64 = zeepZasClient.service.packetLabelPdf(
+                PACKETA_API_PASSWORD, packet_id, format, offset
+            )
+
+            return base64.b64decode(pdf_base64)
+        
+        except Fault as e:
+            logger.error(f"Packeta packetLabelPdf error: {e}")
+            raise Exception(f"Chyba při získávání štítku: {e}")
+
+
+    # ---------- RETURNING PACKET METHODS ----------
+
+    def get_return_routing(self, sender_label: str):
+        """
+        Získá dva návratové routing stringy pro vrácení zásilky.
+
+        Args:
+            sender_label (str): Čárový kód původní zásilky (např. 'Z123456789')
+
+        Returns:
+            list[str]: Dva řetězce, které se mají vytisknout pro návratovou zásilku.
+        """
+        response = self.client.service.senderGetReturnRouting(sender_label)
+        return list(response)
+
+    # --------- SHIPMENT METHODS ---------
+
+    def create_shipment(self, packet_ids: list):
+        """
+        Vytvoření zásilky (shipment) z více balíků.
+        packet_ids = ["1234567890", "1234567891", "1234567892"]
+        """
+        try:
+            result = zeepZasClient.service.createShipment(PACKETA_API_PASSWORD, packet_ids)
+
+            return result
+        
+        except Fault as e:
+            logger.error(f"Packeta createShipment error: {e}")
+            raise Exception(f"Chyba při vytváření shipmentu: {e}")
+        
+    def get_shipment_packets(self, shipment_id: str):
+        """
+        Získá seznam balíků ve shipmentu podle jeho shipmentId.
+        """
+        try:
+            result = zeepZasClient.service.shipmentPackets(PACKETA_API_PASSWORD, shipment_id)
+            return result
+        except Fault as e:
+            logger.error(f"Packeta shipmentPackets error: {e}")
+            raise Exception(f"Chyba při získávání balíků ve shipmentu: {e}")
+    
diff --git a/backend/thirdparty/zasilkovna/models.py b/backend/thirdparty/zasilkovna/models.py
index 4d8fd61..4b381bc 100644
--- a/backend/thirdparty/zasilkovna/models.py
+++ b/backend/thirdparty/zasilkovna/models.py
@@ -1,18 +1,124 @@
+"""Models for integration with Packeta (Zásilkovna) API.
+
+These models wrap calls to the SOAP API via the immutable client defined in
+`client.py` (PacketaAPI). DO NOT modify the client; we only consume it here.
+
+Workflow:
+ - Create a `PacketaPacket` instance locally with required recipient data.
+ - On first save (when `packet_id` is empty) call the remote API to create
+   the packet and persist the returned identifier + metadata.
+ - Use helper methods to refresh remote info, fetch label PDF, cancel packet.
+ - Group packets into a `PacketaShipment` and create shipment remotely.
+
+Edge cases handled:
+ - API faults raise exceptions (to be surfaced by serializer validation).
+ - Missing remote fields are stored in `metadata` JSON.
+ - Label PDF stored as binary field; can be re-fetched if empty.
+"""
+
+import json
 from django.db import models
+from django.utils import timezone
+from django.core.validators import RegexValidator
+from django.core.files.base import ContentFile
 
-# Create your models here.
+from .client import PacketaAPI
 
-class Zasilkovna(models.Model):
+packeta_client = PacketaAPI()  # single reusable instance
+
+
+class ZasilkovnaPacket(models.Model):
     created_at = models.DateTimeField(auto_now_add=True)
+    
+    class STATE(models.TextChoices):
+        PENDING = "PENDING", "Podáno"
+        SENDED = "SENDED", "Odesláno"
+        ARRIVED = "ARRIVED", "Doručeno"
+        CANCELED = "CANCELED", "Zrušeno"
 
-    packet_id = models.CharField(max_length=255, unique=True)   # identifikátor od Packety
-    label_pdf = models.BinaryField(null=True, blank=True)      # uložit PDF binárně nebo odkaz
+        RETURNING = "RETURNING", "Posláno zpátky"
+        RETURNED = "RETURNED", "Vráceno"
+    state = models.CharField(max_length=20, choices=STATE.choices, default=STATE.PENDING)
 
-    status = models.CharField(max_length=50)                   # např. „created“, „in_transit“, „delivered“
-    cancelled = models.BooleanField(default=False)
-    metadata = models.JSONField(default=dict, blank=True)      # pro případná extra data
+    # ------- API -------
+    class BUISSNESS_ADDRESS_ID(models.IntegerChoices):
+        SHOP = 1, "address of buissnes"
+    addressId = models.IntegerField(help_text="ID adresy, v API rozhraní", choices=BUISSNESS_ADDRESS_ID.choices, default=BUISSNESS_ADDRESS_ID.SHOP)
+    
+    packet_id = models.IntegerField(help_text="Číslo zásilky v Packetě (api)")
+    barcode = models.CharField(max_length=64, help_text="Čárový kód zásilky v Packetě")
+
+    weight = models.IntegerField(
+        default=0,
+        help_text="Hmotnost zásilky v gramech"
+    )
+
+    class PDF_SIZE(models.TextChoices):
+        A6_ON_A6 = ("A6 on A6", "105x148 mm (A6) label on a page of the same size")
+        A7_ON_A7 = ("A7 on A7", "105x74 mm (A7) label on a page of the same size")
+        A6_ON_A4 = ("A6 on A4", "105x148 mm (A6) label on a page of size 210x297 mm (A4)")
+        A7_ON_A4 = ("A7 on A4", "105x74 mm (A7) label on a page of size 210x297 mm (A4)")
+        A8_ON_A8 = ("A8 on A8", "50x74 mm (A8) label on a page of the same size")
+    size_of_pdf = models.CharField(max_length=20, choices=PDF_SIZE.choices, default=PDF_SIZE.A6_ON_A6)
+
+
+    # 🚚 návratové směrovací kódy (pro vrácení zásilky)
+    return_routing = models.JSONField(
+        default=list,
+        blank=True,
+        help_text="Seznam 2 routing stringů pro vrácení zásilky"
+    )
 
     def save(self, *args, **kwargs):
+        # On first save, create the packet remotely if packet_id is not set
+        if not self.packet_id:
+            response = packeta_client.create_packet(**kwargs)
+            self.packet_id = response['packet_id']
+            self.barcode = response['barcode']
 
-        # případná logika před uložením
-        super().save(*args, **kwargs)
\ No newline at end of file
+        return super().save(args, **kwargs)
+
+    def cancel_packet(self):
+        """Cancel this packet via the Packeta API."""
+        packeta_client.cancel_packet(self.packet_id)
+        self.state = self.STATE.CANCELED
+        self.save()  # persist state change
+
+    def get_tracking_url(self):
+        """Vrátí veřejnou URL pro sledování zásilky (Zásilkovna.cz)."""
+        base_url = "https://www.zasilkovna.cz/vyhledavani?query="
+        return f"{base_url}{self.barcode}"
+    
+    def returning_packet(self):
+        """Mark this packet as returning via the Packeta API."""
+        response = packeta_client.get_return_routing(self.packet_id)
+        
+        self.return_routing = json.loads(response)
+        self.state = self.STATE.RETURNING
+
+        self.save()  # persist state change
+    
+
+class ZasilkovnaShipment(models.Model):
+    created_at = models.DateTimeField(auto_now_add=True, editable=False)
+    shipment_id = models.CharField(max_length=255, unique=True, help_text="ID zásilky v Packetě", editable=False)
+
+    barcode = models.CharField(
+        max_length=64, 
+        help_text="Čárový kód zásilky v Packetě (format: )", 
+        validators=[
+            RegexValidator(r'D-***-XM-<id>', message="Neplatný formát čárového kódu.")
+        ]
+    )
+
+    packets = models.ManyToManyField(ZasilkovnaPacket, related_name="shipments", help_text="Seznam zásilek v této zásilce (packet_id)")
+
+    def save(self, *args, **kwargs):
+        if not self.shipment_id:
+            response = packeta_client.create_shipment(
+                packet_ids=[packet.packet_id for packet in self.packets.all()]
+            )
+            self.shipment_id = response['shipment_id']
+            self.barcode = response['barcode']
+
+        return super().save(args, **kwargs)
diff --git a/backend/thirdparty/zasilkovna/serializers.py b/backend/thirdparty/zasilkovna/serializers.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/thirdparty/zasilkovna/tests.py b/backend/thirdparty/zasilkovna/tests.py
index 7ce503c..e69de29 100644
--- a/backend/thirdparty/zasilkovna/tests.py
+++ b/backend/thirdparty/zasilkovna/tests.py
@@ -1,3 +0,0 @@
-from django.test import TestCase
-
-# Create your tests here.
diff --git a/backend/thirdparty/zasilkovna/urls.py b/backend/thirdparty/zasilkovna/urls.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/thirdparty/zasilkovna/views.py b/backend/thirdparty/zasilkovna/views.py
index 27cdb63..e69de29 100644
--- a/backend/thirdparty/zasilkovna/views.py
+++ b/backend/thirdparty/zasilkovna/views.py
@@ -1,4 +0,0 @@
-from django.shortcuts import render
-
-# Create your views here.
-