diff --git a/src/Helper/MyParcelCollection.php b/src/Helper/MyParcelCollection.php
index cfdefe09..fb3ddc60 100644
--- a/src/Helper/MyParcelCollection.php
+++ b/src/Helper/MyParcelCollection.php
@@ -264,7 +264,7 @@ public function addMultiCollo(AbstractConsignment $consignment, $amount): self
      * @throws \MyParcelNL\Sdk\src\Exception\ApiException
      * @throws \MyParcelNL\Sdk\src\Exception\MissingFieldException
      */
-    public function createConcepts(): self
+    public function createConcepts(bool $asUnrelatedReturn = false): self
     {
         $newConsignments = $this->where('consignment_id', '!=', null)->toArray();
         $this->addMissingReferenceId();
@@ -275,12 +275,12 @@ public function createConcepts(): self
 
         /* @var MyParcelCollection $consignments */
         foreach ($grouped as $consignments) {
-            $headers = MyParcelRequest::HEADER_CONTENT_TYPE_SHIPMENT;
+            $headers = $asUnrelatedReturn ? MyParcelRequest::HEADER_CONTENT_TYPE_UNRELATED_RETURN_SHIPMENT : MyParcelRequest::HEADER_CONTENT_TYPE_SHIPMENT;
             if ($consignments->first()->hasSender()) {
                 $headers += MyParcelRequest::HEADER_SET_CUSTOM_SENDER;
             }
 
-            $data    = (new CollectionEncode($consignments))->encode();
+            $data    = (new CollectionEncode($consignments))->encode($asUnrelatedReturn ? 'return_shipments' : 'shipments');
             $request = (new MyParcelRequest())
                 ->setUserAgents($this->getUserAgent())
                 ->setRequestParameters(
@@ -305,6 +305,16 @@ public function createConcepts(): self
         return $this;
     }
 
+    /**
+     * @throws \MyParcelNL\Sdk\src\Exception\ApiException
+     * @throws \MyParcelNL\Sdk\src\Exception\AccountNotActiveException
+     * @throws \MyParcelNL\Sdk\src\Exception\MissingFieldException
+     */
+    public function createUnrelatedReturns(): self
+    {
+        return $this->createConcepts(true);
+    }
+
     /**
      * Label prepare wil be active from x number of orders
      *
diff --git a/src/Model/Consignment/AbstractConsignment.php b/src/Model/Consignment/AbstractConsignment.php
index 81f3be28..b71a11fc 100755
--- a/src/Model/Consignment/AbstractConsignment.php
+++ b/src/Model/Consignment/AbstractConsignment.php
@@ -1224,13 +1224,23 @@ public function setBoxNumber(?string $boxNumber): self
     }
 
     /**
-     * @param array $consignmentEncoded
+     * @param  array $consignmentEncoded
+     * @param  bool  $splitStreet todo remove once the API accepts full street for unrelated returns
      *
      * @return array
      * @throws \MyParcelNL\Sdk\src\Exception\MissingFieldException
      */
-    public function encodeStreet(array $consignmentEncoded): array
+    public function encodeStreet(array $consignmentEncoded, bool $splitStreet = false): array
     {
+        if ($splitStreet) {
+            $consignmentEncoded['recipient']['street'] = $this->getStreet(true);
+            $consignmentEncoded['recipient']['number'] = $this->getNumber();
+            $consignmentEncoded['recipient']['number_suffix'] = $this->getNumberSuffix();
+            $consignmentEncoded['recipient']['box_number'] = $this->getBoxNumber();
+            $consignmentEncoded['recipient']['street_additional_info'] = $this->getStreetAdditionalInfo();
+
+            return $consignmentEncoded;
+        }
         $consignmentEncoded['recipient']['street']                 = $this->getFullStreet(true);
         $consignmentEncoded['recipient']['street_additional_info'] = $this->getStreetAdditionalInfo();
 
diff --git a/src/Model/MyParcelRequest.php b/src/Model/MyParcelRequest.php
index db05a674..8ebdd1a6 100644
--- a/src/Model/MyParcelRequest.php
+++ b/src/Model/MyParcelRequest.php
@@ -34,14 +34,11 @@ class MyParcelRequest
     /**
      * API headers.
      */
-    public const HEADER_CONTENT_TYPE_SHIPMENT
-                                                     = [
-            'Content-Type' => 'application/vnd.shipment+json;charset=utf-8;version=1.1',
-        ];
-    public const HEADER_ACCEPT_APPLICATION_PDF       = ['Accept' => 'application/pdf'];
-    public const HEADER_CONTENT_TYPE_RETURN_SHIPMENT = ['Content-Type' => 'application/vnd.return_shipment+json; charset=utf-8'];
-    public const HEADER_SET_CUSTOM_SENDER            = ['x-dmp-set-custom-sender' => 'true'];
-
+    public const HEADER_ACCEPT_APPLICATION_PDF                 = ['Accept' => 'application/pdf'];
+    public const HEADER_CONTENT_TYPE_SHIPMENT                  = ['Content-Type' => 'application/vnd.shipment+json;charset=utf-8;version=1.1'];
+    public const HEADER_CONTENT_TYPE_RETURN_SHIPMENT           = ['Content-Type' => 'application/vnd.return_shipment+json; charset=utf-8'];
+    public const HEADER_CONTENT_TYPE_UNRELATED_RETURN_SHIPMENT = ['Content-Type' => 'application/vnd.unrelated_return_shipment+json;version=1.1; charset=utf-8'];
+    public const HEADER_SET_CUSTOM_SENDER                      = ['x-dmp-set-custom-sender' => 'true'];
     /* @deprecated use HEADER_CONTENT_TYPE_SHIPMENT, HEADER_ACCEPT_APPLICATION_PDF or HEADER_CONTENT_TYPE_RETURN_SHIPMENT */
     public const REQUEST_HEADER_SHIPMENT = 'Content-Type: application/vnd.shipment+json;charset=utf-8;version=1.1';
     /* @deprecated use HEADER_CONTENT_TYPE_SHIPMENT, HEADER_ACCEPT_APPLICATION_PDF or HEADER_CONTENT_TYPE_RETURN_SHIPMENT */
diff --git a/src/Services/CollectionEncode.php b/src/Services/CollectionEncode.php
index 4ca17da5..b63c6844 100644
--- a/src/Services/CollectionEncode.php
+++ b/src/Services/CollectionEncode.php
@@ -31,17 +31,19 @@ public function __construct($consignments)
     /**
      * Encode multiple shipments so that the data can be sent to MyParcel.
      *
+     * @param  string $key default 'shipments', the key under 'data' in which the shipments will be returned
+     *
      * @return string
      * @throws \MyParcelNL\Sdk\src\Exception\MissingFieldException
      */
-    public function encode()
+    public function encode(string $key = 'shipments'): string
     {
         $data = [];
 
         $groupedConsignments = $this->groupMultiColloConsignments();
 
         foreach ($groupedConsignments as $consignments) {
-            $data['data']['shipments'][] = (new ConsignmentEncode($consignments))->apiEncode();
+            $data['data'][$key][] = (new ConsignmentEncode($consignments))->apiEncode('return_shipments' === $key);
         }
 
         // Remove \\n because json_encode encode \\n for \s
diff --git a/src/Services/ConsignmentEncode.php b/src/Services/ConsignmentEncode.php
index 6b9579ae..136bfc7e 100644
--- a/src/Services/ConsignmentEncode.php
+++ b/src/Services/ConsignmentEncode.php
@@ -50,14 +50,15 @@ public function __construct($consignments)
     /**
      * Encode all the data before sending it to MyParcel
      *
+     * @param  bool $splitStreet todo remove this once the API accepts the street as a single field
+     *
      * @return array
      * @throws \MyParcelNL\Sdk\src\Exception\MissingFieldException
-     * @throws \Exception
      */
-    public function apiEncode(): array
+    public function apiEncode(bool $splitStreet = false): array
     {
         $this->encodeBase()
-             ->encodeStreet();
+             ->encodeStreet($splitStreet);
 
         $this->consignmentEncoded = self::encodeExtraOptions(
             $this->consignmentEncoded,
@@ -222,12 +223,14 @@ private function encodeBase(): self
     }
 
     /**
+     * @param  bool $splitStreet todo remove once the API accepts the street as a single field
+     *
      * @return self
      */
-    private function encodeStreet(): self
+    private function encodeStreet(bool $splitStreet): self
     {
         $consignment              = Arr::first($this->consignments);
-        $this->consignmentEncoded = $consignment->encodeStreet($this->consignmentEncoded);
+        $this->consignmentEncoded = $consignment->encodeStreet($this->consignmentEncoded, $splitStreet);
 
         return $this;
     }