4 files changed, 21 insertions, 3 deletions
diff --git a/src/Core/OwnableInterface.php b/src/Core/OwnableInterface.php
new file mode 100644
index 0000000..c54281b
--- /dev/null
+++ b/src/Core/OwnableInterface.php
@@ -0,0 +1,12 @@
+<?php
+namespace IP1\RESTClient\Core;
+
+interface OwnableInterface
+{
+
+    /**
+    * Returns ID of account owning the implemented object.
+    * @return ID of account owning the implemented object.
+    */
+    public function getOwnerID(): string;
+}
diff --git a/src/Recipient/ProcessedContact.php b/src/Recipient/ProcessedContact.php
index 3aa5c1f..5a25e36 100644
--- a/src/Recipient/ProcessedContact.php
+++ b/src/Recipient/ProcessedContact.php
@@ -17,11 +17,15 @@ use IP1\RESTClient\Recipient\RecipientFactory;
 use IP1\RESTClient\Recipient\MembershipRelationInterface;
 use IP1\RESTClient\Core\Communicator;
 use IP1\RESTClient\Core\ClassValidationArray;
+use IP1\RESTClient\Core\OwnableInterface;
 
 /**
 * A Contact that has been added to the API. Has all the options that a normal Contact has.
 */
-class ProcessedContact extends Contact implements UpdatableComponentInterface, MembershipRelationInterface
+class ProcessedContact extends Contact implements
+    UpdatableComponentInterface,
+    MembershipRelationInterface,
+    OwnableInterface
 {
     /**
     * The ID of the Contact given by the API.
diff --git a/src/Recipient/ProcessedGroup.php b/src/Recipient/ProcessedGroup.php
index 8840bd3..87a14d2 100644
--- a/src/Recipient/ProcessedGroup.php
+++ b/src/Recipient/ProcessedGroup.php
@@ -15,11 +15,12 @@ use IP1\RESTClient\Core\Communicator;
 use IP1\RESTClient\Core\UpdatableComponentInterface;
 use IP1\RESTClient\Core\ClassValidationArray;
 use IP1\RESTClient\Recipient\ProcessedMembership;
+use IP1\RESTClient\Core\OwnableInterface;
 
 /**
 *
 */
-class ProcessedGroup extends Group implements UpdatableComponentInterface, MembershipRelationInterface
+class ProcessedGroup extends Group implements UpdatableComponentInterface, MembershipRelationInterface, OwnableInterface
 {
     /**
     * The ID of the Group given by the API.
diff --git a/src/Recipient/ProcessedMembership.php b/src/Recipient/ProcessedMembership.php
index 830354e..590ef0f 100644
--- a/src/Recipient/ProcessedMembership.php
+++ b/src/Recipient/ProcessedMembership.php
@@ -12,12 +12,13 @@
 namespace IP1\RESTClient\Recipient;
 
 use IP1\RESTClient\Core\ProcessedComponentInterface;
+use IP1\RESTClient\Core\OwnableInterface;
 
 /**
 * ProcessedMembership class.
 * Is the relation between contacts and groups.
 */
-class ProcessedMembership extends Membership implements ProcessedComponentInterface
+class ProcessedMembership extends Membership implements ProcessedComponentInterface, OwnableInterface
 {
 
     /**