diff --git a/src/Api/ContactsApi.php b/src/Api/ContactsApi.php
index 5f9b29a..fe1179d 100644
--- a/src/Api/ContactsApi.php
+++ b/src/Api/ContactsApi.php
@@ -7,6 +7,7 @@
 use RealtimeRegister\Domain\ContactCollection;
 use RealtimeRegister\Domain\Country;
 use RealtimeRegister\Domain\CountryCollection;
+use RealtimeRegister\Support\RealtimeRegisterResponse;
 
 final class ContactsApi extends AbstractApi
 {
@@ -110,7 +111,7 @@ public function update(
         ?string $state = null,
         ?string $fax = null,
         ?array $disclosedFields = null
-    ): void {
+    ): RealtimeRegisterResponse {
         $payload = [
             'customer' => $customer,
             'handle' => $handle,
@@ -153,7 +154,7 @@ public function update(
             $payload['disclosedFields'] = $disclosedFields;
         }
 
-        $this->client->post(sprintf('v2/customers/%s/contacts/%s/update', urlencode($customer), urlencode($handle)), $payload);
+        return $this->client->post(sprintf('v2/customers/%s/contacts/%s/update', urlencode($customer), urlencode($handle)), $payload);
     }
 
     /**
diff --git a/src/Domain/AcmeSubscriptionResponse.php b/src/Domain/AcmeSubscriptionResponse.php
index 9fa572c..0f46ef0 100644
--- a/src/Domain/AcmeSubscriptionResponse.php
+++ b/src/Domain/AcmeSubscriptionResponse.php
@@ -28,7 +28,7 @@ public function toArray(): array
     public static function fromArray(array $json): AcmeSubscriptionResponse
     {
         return new AcmeSubscriptionResponse(
-            $json['id'],
+            $json['id'] ?? null,
             $json['directoryUrl'],
             $json['accountKey'],
             $json['hmacKey']
diff --git a/src/Support/AuthorizedClient.php b/src/Support/AuthorizedClient.php
index cd4e81d..a9e1b4e 100644
--- a/src/Support/AuthorizedClient.php
+++ b/src/Support/AuthorizedClient.php
@@ -112,7 +112,7 @@ private function handleResponse(ResponseInterface $response, ?int $expectedRespo
 
         // Parse response
         if ($this->isResponseValid($response, $expectedResponse)) {
-            return RealtimeRegisterResponse::fromString((string) $response->getBody(), $response->getHeaders());
+            return RealtimeRegisterResponse::fromString((string) $response->getBody(), $response->getHeaders(), $response->getStatusCode());
         } elseif ($response->getStatusCode() === 400) {
             throw new BadRequestException('Bad Request: ' . $response->getBody());
         } elseif ($response->getStatusCode() === 401) {
diff --git a/src/Support/RealtimeRegisterResponse.php b/src/Support/RealtimeRegisterResponse.php
index d9f2048..86750e5 100644
--- a/src/Support/RealtimeRegisterResponse.php
+++ b/src/Support/RealtimeRegisterResponse.php
@@ -10,10 +10,13 @@ class RealtimeRegisterResponse
 
     private array $headers;
 
-    public function __construct(string $response, array $headers)
+    private int $resultCode;
+
+    public function __construct(string $response, array $headers, int $resultCode)
     {
         $this->response = $response;
         $this->headers = $headers;
+        $this->resultCode = $resultCode;
     }
 
     public function __toString(): string
@@ -21,9 +24,9 @@ public function __toString(): string
         return $this->text();
     }
 
-    public static function fromString(string $response, array $headers): RealtimeRegisterResponse
+    public static function fromString(string $response, array $headers, int $resultCode = -1): RealtimeRegisterResponse
     {
-        return new RealtimeRegisterResponse($response, array_change_key_case($headers));
+        return new RealtimeRegisterResponse($response, array_change_key_case($headers), $resultCode);
     }
 
     public function json(): array
@@ -46,4 +49,9 @@ public function headers(): array
     {
         return $this->headers;
     }
+
+    public function resultCode(): int
+    {
+        return $this->resultCode;
+    }
 }
diff --git a/tests/ResponseObjectTest.php b/tests/ResponseObjectTest.php
index 3ecc44d..05744d9 100644
--- a/tests/ResponseObjectTest.php
+++ b/tests/ResponseObjectTest.php
@@ -11,7 +11,7 @@ class ResponseObjectTest extends TestCase
 {
     public function test_get_text(): void
     {
-        $response = RealtimeRegisterResponse::fromString('This is text', ['foo' => 'bar']);
+        $response = RealtimeRegisterResponse::fromString('This is text', ['foo' => 'bar'], 200);
 
         $this->assertSame('This is text', $response->text());
         $this->assertSame(['foo' => 'bar'], $response->headers());
@@ -19,14 +19,14 @@ public function test_get_text(): void
 
     public function test_to_string(): void
     {
-        $response = RealtimeRegisterResponse::fromString('This is text', ['foo' => 'bar']);
+        $response = RealtimeRegisterResponse::fromString('This is text', ['foo' => 'bar'], 200);
 
         $this->assertSame('This is text', (string) $response);
     }
 
     public function test_parse_json(): void
     {
-        $response = RealtimeRegisterResponse::fromString('{"foo": "bar"}', ['foo' => 'bar']);
+        $response = RealtimeRegisterResponse::fromString('{"foo": "bar"}', ['foo' => 'bar'], 200);
 
         $this->assertSame(['foo' => 'bar'], $response->json());
         $this->assertSame(['foo' => 'bar'], $response->headers());
@@ -34,7 +34,7 @@ public function test_parse_json(): void
 
     public function test_invalid_json(): void
     {
-        $response = RealtimeRegisterResponse::fromString('{"foo":  <><>>>>><<<< {{{{{{{{{{{{) "bar"}', ['foo' => 'bar']);
+        $response = RealtimeRegisterResponse::fromString('{"foo":  <><>>>>><<<< {{{{{{{{{{{{) "bar"}', ['foo' => 'bar'], 400);
 
         $this->expectException(UnexpectedValueException::class);
         $response->json();