diff --git a/src/main/java/com/resend/Resend.java b/src/main/java/com/resend/Resend.java
index 0de7de9..9042b69 100644
--- a/src/main/java/com/resend/Resend.java
+++ b/src/main/java/com/resend/Resend.java
@@ -5,6 +5,7 @@
 import com.resend.services.batch.Batch;
 import com.resend.services.broadcasts.Broadcasts;
 import com.resend.services.contacts.Contacts;
+import com.resend.services.contactproperties.ContactProperties;
 import com.resend.services.domains.Domains;
 import com.resend.services.emails.Emails;
 import com.resend.services.webhooks.Webhooks;
@@ -67,6 +68,15 @@ public Contacts contacts() {
         return new Contacts(apiKey);
     }
 
+    /**
+     * Returns a ContactProperties object that can be used to interact with the ContactProperties service.
+     *
+     * @return A ContactProperties object.
+     */
+    public ContactProperties contactProperties() {
+        return new ContactProperties(apiKey);
+    }
+
     /**
      * Returns an Audience object that can be used to interact with the Audiences service.
      *
diff --git a/src/main/java/com/resend/services/contactproperties/ContactProperties.java b/src/main/java/com/resend/services/contactproperties/ContactProperties.java
new file mode 100644
index 0000000..1a6d43c
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/ContactProperties.java
@@ -0,0 +1,130 @@
+package com.resend.services.contactproperties;
+
+import com.resend.core.exception.ResendException;
+import com.resend.core.net.AbstractHttpResponse;
+import com.resend.core.net.HttpMethod;
+import com.resend.core.service.BaseService;
+import com.resend.services.contactproperties.model.*;
+import okhttp3.MediaType;
+
+/**
+ * Represents the Resend ContactProperties module.
+ */
+public class ContactProperties extends BaseService {
+
+    /**
+     * Constructs an instance of the {@code ContactProperties} class.
+     *
+     * @param apiKey The apiKey used for authentication.
+     */
+    public ContactProperties(final String apiKey) {
+        super(apiKey);
+    }
+
+    /**
+     * Creates a ContactProperty.
+     *
+     * @param createContactPropertyOptions The ContactProperty details.
+     * @return The details of the created contact property.
+     * @throws ResendException If an error occurs during the ContactProperty creation process.
+     */
+    public CreateContactPropertyResponseSuccess create(CreateContactPropertyOptions createContactPropertyOptions) throws ResendException {
+        String payload = super.resendMapper.writeValue(createContactPropertyOptions);
+        AbstractHttpResponse<String> response = httpClient.perform("/contact-properties", super.apiKey, HttpMethod.POST, payload, MediaType.get("application/json"));
+
+        if (!response.isSuccessful()) {
+            throw new ResendException(response.getCode(), response.getBody());
+        }
+
+        String responseBody = response.getBody();
+        return resendMapper.readValue(responseBody, CreateContactPropertyResponseSuccess.class);
+    }
+
+    /**
+     * Retrieves a list of contact properties and returns a ListContactPropertiesResponseSuccess.
+     *
+     * @return A ListContactPropertiesResponseSuccess containing the list of contact properties.
+     * @throws ResendException If an error occurs during the contact properties list retrieval process.
+     */
+    public ListContactPropertiesResponseSuccess list() throws ResendException {
+        AbstractHttpResponse<String> response = this.httpClient.perform("/contact-properties", super.apiKey, HttpMethod.GET, null, MediaType.get("application/json"));
+
+        if (!response.isSuccessful()) {
+            throw new ResendException(response.getCode(), response.getBody());
+        }
+
+        String responseBody = response.getBody();
+
+        return resendMapper.readValue(responseBody, ListContactPropertiesResponseSuccess.class);
+    }
+
+    /**
+     * Retrieves a contact property by its unique identifier.
+     *
+     * @param id The contact property's id.
+     * @return The retrieved contact property details.
+     * @throws ResendException If an error occurs while retrieving the contact property.
+     */
+    public ContactProperty get(String id) throws ResendException {
+        if (id == null || id.isEmpty()) {
+            throw new IllegalArgumentException("Contact property id must be provided");
+        }
+
+        AbstractHttpResponse<String> response = this.httpClient.perform("/contact-properties/" + id, super.apiKey, HttpMethod.GET, null, MediaType.get("application/json"));
+
+        if (!response.isSuccessful()) {
+            throw new ResendException(response.getCode(), response.getBody());
+        }
+
+        String responseBody = response.getBody();
+
+        return resendMapper.readValue(responseBody, ContactProperty.class);
+    }
+
+    /**
+     * Updates a contact property based on the provided contact property ID.
+     *
+     * @param updateContactPropertyOptions The object with the contact property id and fallback value to update.
+     * @return The UpdateContactPropertyResponseSuccess with the details of the updated contact property.
+     * @throws ResendException If an error occurs during the contact property update process.
+     */
+    public UpdateContactPropertyResponseSuccess update(UpdateContactPropertyOptions updateContactPropertyOptions) throws ResendException {
+        if (updateContactPropertyOptions.getId() == null || updateContactPropertyOptions.getId().isEmpty()) {
+            throw new IllegalArgumentException("Contact property id must be provided");
+        }
+
+        String payload = super.resendMapper.writeValue(updateContactPropertyOptions);
+        AbstractHttpResponse<String> response = httpClient.perform("/contact-properties/" + updateContactPropertyOptions.getId(), super.apiKey, HttpMethod.PATCH, payload, MediaType.get("application/json"));
+
+        if (!response.isSuccessful()) {
+            throw new ResendException(response.getCode(), response.getBody());
+        }
+
+        String responseBody = response.getBody();
+
+        return resendMapper.readValue(responseBody, UpdateContactPropertyResponseSuccess.class);
+    }
+
+    /**
+     * Deletes a contact property based on the provided contact property ID.
+     *
+     * @param id The identifier of the contact property to delete.
+     * @return The RemoveContactPropertyResponseSuccess with the details of the removed contact property.
+     * @throws ResendException If an error occurs during the contact property deletion process.
+     */
+    public RemoveContactPropertyResponseSuccess remove(String id) throws ResendException {
+        if (id == null || id.isEmpty()) {
+            throw new IllegalArgumentException("Contact property id must be provided");
+        }
+
+        AbstractHttpResponse<String> response = httpClient.perform("/contact-properties/" + id, super.apiKey, HttpMethod.DELETE, "", null);
+
+        if (!response.isSuccessful()) {
+            throw new ResendException(response.getCode(), response.getBody());
+        }
+
+        String responseBody = response.getBody();
+
+        return resendMapper.readValue(responseBody, RemoveContactPropertyResponseSuccess.class);
+    }
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/BaseContactProperty.java b/src/main/java/com/resend/services/contactproperties/model/BaseContactProperty.java
new file mode 100644
index 0000000..62b6bbc
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/BaseContactProperty.java
@@ -0,0 +1,50 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Base contact property with common properties
+ */
+public abstract class BaseContactProperty {
+    @JsonProperty("id")
+    private String id;
+
+    @JsonProperty("object")
+    private String object;
+
+    /**
+     * Default constructor
+     */
+    public BaseContactProperty() {
+    }
+
+    /**
+     * Constructs a base contact property.
+     *
+     * @param id        The ID of the contact property.
+     * @param object    The object type of the contact property.
+     */
+    public BaseContactProperty(final String id, final String object) {
+        this.id = id;
+        this.object = object;
+    }
+
+    /**
+     * Gets the ID of the contact property.
+     *
+     * @return The ID of the contact property.
+     */
+    public String getId() {
+        return id;
+    }
+
+    /**
+     * Gets the object type of the contact property.
+     *
+     * @return The object type of the contact property.
+     */
+    public String getObject() {
+        return object;
+    }
+
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/ContactProperty.java b/src/main/java/com/resend/services/contactproperties/model/ContactProperty.java
new file mode 100644
index 0000000..1c36f83
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/ContactProperty.java
@@ -0,0 +1,107 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Represents a contact property item.
+ */
+public class ContactProperty {
+
+    @JsonProperty("id")
+    private String id;
+
+    @JsonProperty("key")
+    private String key;
+
+    @JsonProperty("object")
+    private String object;
+
+    @JsonProperty("created_at")
+    private String createdAt;
+
+    @JsonProperty("type")
+    private String type;
+
+    @JsonProperty("fallback_value")
+    private Object fallbackValue;
+
+    /**
+     * Default constructor
+     */
+    public ContactProperty() {
+
+    }
+
+    /**
+     * Creates an instance of ContactProperty with the specified attributes.
+     *
+     * @param id              The ID of the contact property.
+     * @param key             The key of the contact property.
+     * @param object          The object type of the contact property.
+     * @param createdAt       The creation timestamp of the contact property.
+     * @param type            The type of the contact property.
+     * @param fallbackValue   The fallback value of the contact property.
+     */
+    public ContactProperty(final String id, final String key, final String object, final String createdAt, final String type, final Object fallbackValue) {
+        this.id = id;
+        this.key = key;
+        this.object = object;
+        this.createdAt = createdAt;
+        this.type = type;
+        this.fallbackValue = fallbackValue;
+    }
+
+    /**
+     * Gets the ID of the contact property.
+     *
+     * @return The ID of the contact property.
+     */
+    public String getId() {
+        return id;
+    }
+
+    /**
+     * Gets the key of the contact property.
+     *
+     * @return The key of the contact property.
+     */
+    public String getKey() {
+        return key;
+    }
+
+    /**
+     * Gets the object type of the contact property.
+     *
+     * @return The object type of the contact property.
+     */
+    public String getObject() {
+        return object;
+    }
+
+    /**
+     * Gets the creation timestamp of the contact property.
+     *
+     * @return The creation timestamp of the contact property.
+     */
+    public String getCreatedAt() {
+        return createdAt;
+    }
+
+    /**
+     * Gets the type of the contact property.
+     *
+     * @return The type of the contact property.
+     */
+    public String getType() {
+        return type;
+    }
+
+    /**
+     * Gets the fallback value of the contact property.
+     *
+     * @return The fallback value of the contact property.
+     */
+    public Object getFallbackValue() {
+        return fallbackValue;
+    }
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyOptions.java b/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyOptions.java
new file mode 100644
index 0000000..5d30c25
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyOptions.java
@@ -0,0 +1,116 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Represents a request to create a contact property.
+ */
+public class CreateContactPropertyOptions {
+
+    @JsonProperty("key")
+    private final String key;
+
+    @JsonProperty("type")
+    private final String type;
+
+    @JsonProperty("fallback_value")
+    private final Object fallbackValue;
+
+    /**
+     * Constructs a CreateContactPropertyOptions object using the provided builder.
+     *
+     * @param builder The builder to construct the CreateContactPropertyOptions.
+     */
+    public CreateContactPropertyOptions(Builder builder) {
+        this.key = builder.key;
+        this.type = builder.type;
+        this.fallbackValue = builder.fallbackValue;
+    }
+
+    /**
+     * Get the key of the contact property.
+     *
+     * @return The key of the contact property.
+     */
+    public String getKey() {
+        return key;
+    }
+
+    /**
+     * Get the type of the contact property.
+     *
+     * @return The type of the contact property.
+     */
+    public String getType() {
+        return type;
+    }
+
+    /**
+     * Get the fallback value of the contact property.
+     *
+     * @return The fallback value of the contact property.
+     */
+    public Object getFallbackValue() {
+        return fallbackValue;
+    }
+
+    /**
+     * Create a new builder instance for constructing CreateContactPropertyOptions objects.
+     *
+     * @return A new builder instance.
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder class for constructing CreateContactPropertyOptions objects.
+     */
+    public static class Builder {
+        private String key;
+        private String type;
+        private Object fallbackValue;
+
+        /**
+         * Set the key of the contact property.
+         *
+         * @param key The key of the contact property.
+         * @return The builder instance.
+         */
+        public Builder key(String key) {
+            this.key = key;
+            return this;
+        }
+
+        /**
+         * Set the type of the contact property.
+         *
+         * @param type The type of the contact property.
+         * @return The builder instance.
+         */
+        public Builder type(String type) {
+            this.type = type;
+            return this;
+        }
+
+        /**
+         * Set the fallback value of the contact property.
+         *
+         * @param fallbackValue The fallback value of the contact property.
+         * @return The builder instance.
+         */
+        public Builder fallbackValue(Object fallbackValue) {
+            this.fallbackValue = fallbackValue;
+            return this;
+        }
+
+        /**
+         * Build a new CreateContactPropertyOptions object.
+         *
+         * @return A new CreateContactPropertyOptions object.
+         */
+        public CreateContactPropertyOptions build() {
+            return new CreateContactPropertyOptions(this);
+        }
+    }
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyResponseSuccess.java b/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyResponseSuccess.java
new file mode 100644
index 0000000..c20def1
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/CreateContactPropertyResponseSuccess.java
@@ -0,0 +1,24 @@
+package com.resend.services.contactproperties.model;
+
+/**
+ * Represents a successful response for creating a contact property.
+ */
+public class CreateContactPropertyResponseSuccess extends BaseContactProperty {
+
+    /**
+     * Default constructor
+     */
+    public CreateContactPropertyResponseSuccess() {
+    }
+
+    /**
+     * Constructs a successful response for creating a contact property.
+     *
+     * @param id        The ID of the contact property.
+     * @param object    The object type of the contact property.
+     */
+    public CreateContactPropertyResponseSuccess(final String id, final String object) {
+        super(id, object);
+    }
+
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/ListContactPropertiesResponseSuccess.java b/src/main/java/com/resend/services/contactproperties/model/ListContactPropertiesResponseSuccess.java
new file mode 100644
index 0000000..5d28e56
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/ListContactPropertiesResponseSuccess.java
@@ -0,0 +1,52 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.util.List;
+
+/**
+ * Represents a successful response for listing contact properties.
+ */
+public class ListContactPropertiesResponseSuccess {
+
+    @JsonProperty("data")
+    private List<ContactProperty> data;
+
+    @JsonProperty("object")
+    private String object;
+
+    /**
+     * Default constructor
+     */
+    public ListContactPropertiesResponseSuccess() {
+    }
+
+    /**
+     * Constructs a successful response for listing contact properties.
+     *
+     * @param data      The list of contact properties.
+     * @param object    The object type.
+     */
+    public ListContactPropertiesResponseSuccess(final List<ContactProperty> data, final String object) {
+        this.data = data;
+        this.object = object;
+    }
+
+    /**
+     * Gets the list of contact properties.
+     *
+     * @return The list of contact properties.
+     */
+    public List<ContactProperty> getData() {
+        return data;
+    }
+
+    /**
+     * Gets the object type.
+     *
+     * @return The object type.
+     */
+    public String getObject() {
+        return object;
+    }
+
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/RemoveContactPropertyResponseSuccess.java b/src/main/java/com/resend/services/contactproperties/model/RemoveContactPropertyResponseSuccess.java
new file mode 100644
index 0000000..8a036c0
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/RemoveContactPropertyResponseSuccess.java
@@ -0,0 +1,40 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Represents a successful response for removing a contact property.
+ */
+public class RemoveContactPropertyResponseSuccess extends BaseContactProperty {
+
+    @JsonProperty("deleted")
+    private boolean deleted;
+
+    /**
+     * Default constructor
+     */
+    public RemoveContactPropertyResponseSuccess() {
+    }
+
+    /**
+     * Constructs a successful response for removing a contact property.
+     *
+     * @param id        The ID of the contact property.
+     * @param object    The object type of the contact property.
+     * @param deleted   Whether the contact property was deleted.
+     */
+    public RemoveContactPropertyResponseSuccess(final String id, final String object, final boolean deleted) {
+        super(id, object);
+        this.deleted = deleted;
+    }
+
+    /**
+     * Gets whether the contact property was deleted.
+     *
+     * @return Whether the contact property was deleted.
+     */
+    public boolean isDeleted() {
+        return deleted;
+    }
+
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyOptions.java b/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyOptions.java
new file mode 100644
index 0000000..04b425f
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyOptions.java
@@ -0,0 +1,91 @@
+package com.resend.services.contactproperties.model;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Represents a request to update a contact property.
+ */
+public class UpdateContactPropertyOptions {
+
+    @JsonProperty("id")
+    private final String id;
+
+    @JsonProperty("fallback_value")
+    private final Object fallbackValue;
+
+    /**
+     * Constructs an UpdateContactPropertyOptions object using the provided builder.
+     *
+     * @param builder The builder to construct the UpdateContactPropertyOptions.
+     */
+    public UpdateContactPropertyOptions(Builder builder) {
+        this.id = builder.id;
+        this.fallbackValue = builder.fallbackValue;
+    }
+
+    /**
+     * Get the ID of the contact property.
+     *
+     * @return The ID of the contact property.
+     */
+    public String getId() {
+        return id;
+    }
+
+    /**
+     * Get the fallback value of the contact property.
+     *
+     * @return The fallback value of the contact property.
+     */
+    public Object getFallbackValue() {
+        return fallbackValue;
+    }
+
+    /**
+     * Create a new builder instance for constructing UpdateContactPropertyOptions objects.
+     *
+     * @return A new builder instance.
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder class for constructing UpdateContactPropertyOptions objects.
+     */
+    public static class Builder {
+        private String id;
+        private Object fallbackValue;
+
+        /**
+         * Set the ID of the contact property.
+         *
+         * @param id The ID of the contact property.
+         * @return The builder instance.
+         */
+        public Builder id(String id) {
+            this.id = id;
+            return this;
+        }
+
+        /**
+         * Set the fallback value of the contact property.
+         *
+         * @param fallbackValue The fallback value of the contact property.
+         * @return The builder instance.
+         */
+        public Builder fallbackValue(Object fallbackValue) {
+            this.fallbackValue = fallbackValue;
+            return this;
+        }
+
+        /**
+         * Build a new UpdateContactPropertyOptions object.
+         *
+         * @return A new UpdateContactPropertyOptions object.
+         */
+        public UpdateContactPropertyOptions build() {
+            return new UpdateContactPropertyOptions(this);
+        }
+    }
+}
diff --git a/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyResponseSuccess.java b/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyResponseSuccess.java
new file mode 100644
index 0000000..ca5a596
--- /dev/null
+++ b/src/main/java/com/resend/services/contactproperties/model/UpdateContactPropertyResponseSuccess.java
@@ -0,0 +1,24 @@
+package com.resend.services.contactproperties.model;
+
+/**
+ * Represents a successful response for updating a contact property.
+ */
+public class UpdateContactPropertyResponseSuccess extends BaseContactProperty {
+
+    /**
+     * Default constructor
+     */
+    public UpdateContactPropertyResponseSuccess() {
+    }
+
+    /**
+     * Constructs a successful response for updating a contact property.
+     *
+     * @param id        The ID of the contact property.
+     * @param object    The object type of the contact property.
+     */
+    public UpdateContactPropertyResponseSuccess(final String id, final String object) {
+        super(id, object);
+    }
+
+}
diff --git a/src/test/java/com/resend/services/contactproperties/ContactPropertiesTest.java b/src/test/java/com/resend/services/contactproperties/ContactPropertiesTest.java
new file mode 100644
index 0000000..aa4183a
--- /dev/null
+++ b/src/test/java/com/resend/services/contactproperties/ContactPropertiesTest.java
@@ -0,0 +1,96 @@
+package com.resend.services.contactproperties;
+
+import com.resend.core.exception.ResendException;
+import com.resend.services.contactproperties.model.*;
+import com.resend.services.util.ContactPropertiesUtil;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.mockito.Mockito.*;
+
+public class ContactPropertiesTest {
+
+    @Mock
+    private ContactProperties contactProperties;
+
+    @BeforeEach
+    public void setUp() {
+        MockitoAnnotations.openMocks(this);
+        contactProperties = mock(ContactProperties.class);
+    }
+
+    @Test
+    public void testCreateContactProperty_Success() throws ResendException {
+        CreateContactPropertyResponseSuccess expected = ContactPropertiesUtil.createContactPropertyResponseSuccess();
+        CreateContactPropertyOptions param = ContactPropertiesUtil.createContactPropertyRequest();
+
+        when(contactProperties.create(param))
+                .thenReturn(expected);
+
+        CreateContactPropertyResponseSuccess created = contactProperties.create(param);
+
+        assertEquals(created, expected);
+        verify(contactProperties, times(1)).create(param);
+    }
+
+    @Test
+    public void testListContactProperties_Success() throws ResendException {
+        ListContactPropertiesResponseSuccess expectedResponse = ContactPropertiesUtil.createContactPropertiesListResponse();
+
+        when(contactProperties.list())
+                .thenReturn(expectedResponse);
+
+        ListContactPropertiesResponseSuccess res = contactProperties.list();
+
+        assertNotNull(res);
+        assertEquals(expectedResponse.getData().size(), res.getData().size());
+        assertEquals(expectedResponse.getObject(), res.getObject());
+    }
+
+    @Test
+    public void testGetContactProperty_Success() throws ResendException {
+        String id = "123";
+        ContactProperty expected = ContactPropertiesUtil.getContactProperty();
+
+        when(contactProperties.get(id)).thenReturn(expected);
+
+        ContactProperty res = contactProperties.get(id);
+
+        assertNotNull(res);
+        assertEquals(expected, res);
+        verify(contactProperties, times(1)).get(id);
+    }
+
+    @Test
+    public void testUpdateContactProperty_Success() throws ResendException {
+        UpdateContactPropertyOptions params = ContactPropertiesUtil.createUpdateOptions();
+        UpdateContactPropertyResponseSuccess expectedResponse = ContactPropertiesUtil.updateContactPropertyResponseSuccess();
+
+        when(contactProperties.update(params))
+                .thenReturn(expectedResponse);
+
+        UpdateContactPropertyResponseSuccess res = contactProperties.update(params);
+
+        assertNotNull(res);
+        assertEquals(expectedResponse.getId(), res.getId());
+        assertEquals(expectedResponse.getObject(), res.getObject());
+    }
+
+    @Test
+    public void testRemoveContactProperty_Success() throws ResendException {
+        String id = "123";
+        RemoveContactPropertyResponseSuccess removed = ContactPropertiesUtil.removeContactPropertyResponseSuccess();
+
+        when(contactProperties.remove(id))
+                .thenReturn(removed);
+
+        RemoveContactPropertyResponseSuccess res = contactProperties.remove(id);
+
+        assertEquals(removed, res);
+        verify(contactProperties, times(1)).remove(id);
+    }
+}
diff --git a/src/test/java/com/resend/services/util/ContactPropertiesUtil.java b/src/test/java/com/resend/services/util/ContactPropertiesUtil.java
new file mode 100644
index 0000000..36082a6
--- /dev/null
+++ b/src/test/java/com/resend/services/util/ContactPropertiesUtil.java
@@ -0,0 +1,61 @@
+package com.resend.services.util;
+
+import com.resend.services.contactproperties.model.*;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ContactPropertiesUtil {
+
+    public static CreateContactPropertyOptions createContactPropertyRequest() {
+        return CreateContactPropertyOptions.builder()
+                .key("age")
+                .type("number")
+                .fallbackValue(25)
+                .build();
+    }
+
+    public static CreateContactPropertyResponseSuccess createContactPropertyResponseSuccess() {
+        return new CreateContactPropertyResponseSuccess("123", "contact_property");
+    }
+
+    public static UpdateContactPropertyOptions createUpdateOptions() {
+        return UpdateContactPropertyOptions.builder()
+                .id("123")
+                .fallbackValue(30)
+                .build();
+    }
+
+    public static UpdateContactPropertyResponseSuccess updateContactPropertyResponseSuccess() {
+        return new UpdateContactPropertyResponseSuccess("123", "contact_property");
+    }
+
+    public static RemoveContactPropertyResponseSuccess removeContactPropertyResponseSuccess() {
+        return new RemoveContactPropertyResponseSuccess("123", "contact_property", true);
+    }
+
+    public static ContactProperty getContactProperty() {
+        return new ContactProperty(
+                "123",
+                "age",
+                "contact_property",
+                "2023-04-08T00:11:13.110779+00:00",
+                "number",
+                25
+        );
+    }
+
+    public static ListContactPropertiesResponseSuccess createContactPropertiesListResponse() {
+        List<ContactProperty> properties = new ArrayList<>();
+
+        ContactProperty p1 = new ContactProperty("1", "age", "contact_property", "2023-04-08T00:11:13.110779+00:00", "number", 25);
+        ContactProperty p2 = new ContactProperty("2", "city", "contact_property", "2023-04-08T00:11:13.110779+00:00", "string", "New York");
+        ContactProperty p3 = new ContactProperty("3", "subscribed", "contact_property", "2023-04-08T00:11:13.110779+00:00", "boolean", true);
+
+        properties.add(p1);
+        properties.add(p2);
+        properties.add(p3);
+
+        return new ListContactPropertiesResponseSuccess(properties, "list");
+    }
+}