diff --git a/examples/IntegrateApi.php b/examples/IntegrateApi.php
index c1f40f3..6a501c7 100644
--- a/examples/IntegrateApi.php
+++ b/examples/IntegrateApi.php
@@ -19,7 +19,11 @@
             'sync_key' => 'foobar',
         ]);
         $account->upsert();
-        echo "Record: " . json_encode($account->toArray(), JSON_PRETTY_PRINT) . "\n";
+        echo "Record Created: " . json_encode($account->toArray(), JSON_PRETTY_PRINT) . "\n";
+        $account->account_type = 'Prospect';
+        $account->email1 = 'test@example.com';
+        $account->upsert();
+        echo "Account Updated: " . json_encode($account->toArray(), JSON_PRETTY_PRINT) . "\n";
 
         $contact = $SugarAPI->module('Contacts');
         $contact->set([
diff --git a/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php b/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
index 3507d71..ba20ac1 100644
--- a/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
+++ b/src/Endpoint/Abstracts/AbstractSugarBeanEndpoint.php
@@ -184,8 +184,17 @@ protected function configurePayload(): mixed
         $data = $this->getData();
         switch ($this->getCurrentAction()) {
             case self::BEAN_ACTION_UPSERT:
+                $fields = [];
+                if (isset($data[AbstractSugarBeanCollectionEndpoint::SUGAR_FIELDS_DATA_PROPERTY])) {
+                    $fields = $data[AbstractSugarBeanCollectionEndpoint::SUGAR_FIELDS_DATA_PROPERTY];
+                }
+
                 $data->reset();
                 $data->set($this->toArray());
+                if (!empty($fields)) {
+                    $data[AbstractSugarBeanCollectionEndpoint::SUGAR_FIELDS_DATA_PROPERTY] = $fields;
+                }
+
                 $syncKeyField = $this->getSyncKeyField();
                 if (!empty($syncKeyField)) {
                     $data[Integrate::DATA_SYNC_KEY_FIELD] = $syncKeyField;
@@ -215,7 +224,7 @@ protected function configurePayload(): mixed
     protected function parseResponse(Response $response): void
     {
         $this->resetUploads();
-        if ($response->getStatusCode() == 200) {
+        if (in_array($response->getStatusCode(), [200,201])) {
             $this->getData()->reset();
             switch ($this->getCurrentAction()) {
                 case self::BEAN_ACTION_TEMP_FILE_UPLOAD:
@@ -236,7 +245,17 @@ protected function parseResponse(Response $response): void
                     return;
                 case self::BEAN_ACTION_UPSERT:
                     $body = $this->getResponseContent($response);
-                    $this->syncFromApi($this->parseResponseBodyToArray($body, Integrate::INTEGRATE_RESPONSE_PROP));
+                    $body = $this->parseResponseBodyToArray($body);
+                    if (!empty($body[Integrate::INTEGRATE_RESPONSE_PROP])) {
+                        if (is_string($body[Integrate::INTEGRATE_RESPONSE_PROP])) {
+                            $model = ['id' => $body[Integrate::INTEGRATE_RESPONSE_PROP]];
+                        } else {
+                            $model = $body[Integrate::INTEGRATE_RESPONSE_PROP];
+                        }
+
+                        $this->syncFromApi($model);
+                    }
+
                     return;
             }
         }
diff --git a/src/Endpoint/Integrate.php b/src/Endpoint/Integrate.php
index 83cff9d..9c5a104 100644
--- a/src/Endpoint/Integrate.php
+++ b/src/Endpoint/Integrate.php
@@ -105,6 +105,7 @@ protected function configureAction(string $action, array $arguments = []): void
                 $action = self::INTEGRATE_ACTION_RETRIEVE;
                 break;
         }
+
         if ($this->_action !== $action) {
             $this->_action = $action;
         }
@@ -159,7 +160,7 @@ protected function configurePayload(): mixed
 
     protected function parseResponse(Response $response): void
     {
-        if ($response->getStatusCode() == 200) {
+        if (in_array($response->getStatusCode(), [200,201])) {
             switch ($this->getCurrentAction()) {
                 case self::INTEGRATE_ACTION_DELETE:
                 case self::MODEL_ACTION_DELETE:
@@ -174,16 +175,25 @@ protected function parseResponse(Response $response): void
                         $syncKeyField = $this->getSyncKeyField();
                         $syncKey = $this->getSyncKey();
                         $this->_sugarBean->set($syncKeyField ?: self::SYNC_KEY, $syncKey);
-                        if ($syncKeyField !== '' && $syncKeyField !== '0') {
+                        if ($syncKeyField !== '' && $syncKeyField !== self::SYNC_KEY) {
                             $this->_sugarBean->setSyncKeyField($syncKeyField);
                         }
                     }
 
                     if ($this->getCurrentAction() !== self::INTEGRATE_ACTION_SET_SK) {
                         $body = $this->getResponseContent($response);
-                        $this->syncFromApi($this->parseResponseBodyToArray($body, $this->getModelResponseProp()));
-                        if (isset($this->_sugarBean)) {
-                            $this->_sugarBean->set($this->toArray());
+                        $body = $this->parseResponseBodyToArray($body);
+                        if (!empty($body[Integrate::INTEGRATE_RESPONSE_PROP])) {
+                            if (is_string($body[Integrate::INTEGRATE_RESPONSE_PROP])) {
+                                $model = ['id' => $body[Integrate::INTEGRATE_RESPONSE_PROP]];
+                            } else {
+                                $model = $body[Integrate::INTEGRATE_RESPONSE_PROP];
+                            }
+
+                            $this->syncFromApi($model);
+                            if (isset($this->_sugarBean)) {
+                                $this->_sugarBean->set($this->toArray());
+                            }
                         }
                     }
             }
diff --git a/src/Endpoint/Note.php b/src/Endpoint/Note.php
index 184f9cb..8c2bb07 100644
--- a/src/Endpoint/Note.php
+++ b/src/Endpoint/Note.php
@@ -96,7 +96,7 @@ public function clear(): static
      * Reset the attachments link to default blank values
      * @return $this
      */
-    public function resetAttachments(): self
+    public function resetAttachments(): static
     {
         $this->resetAttachmentsProp();
         $this->getData()->offsetUnset($this->getAttachmentsLinkField());
diff --git a/src/Endpoint/Traits/IntegrateSyncKeyTrait.php b/src/Endpoint/Traits/IntegrateSyncKeyTrait.php
index c8645dc..b666901 100644
--- a/src/Endpoint/Traits/IntegrateSyncKeyTrait.php
+++ b/src/Endpoint/Traits/IntegrateSyncKeyTrait.php
@@ -38,10 +38,12 @@ public function getSyncKey(): string|int|null
 
         if (method_exists($this, 'get')) {
             $key = $this->get($field);
+            //@codeCoverageIgnoreStart
         } elseif (property_exists($this, '_attributes')) {
             $key = $this->_attributes[$field];
         }
 
+        //@codeCoverageIgnoreEnd
         return $key;
     }
 
diff --git a/src/Endpoint/Traits/NoteAttachmentsTrait.php b/src/Endpoint/Traits/NoteAttachmentsTrait.php
index d27a3fd..a44972a 100644
--- a/src/Endpoint/Traits/NoteAttachmentsTrait.php
+++ b/src/Endpoint/Traits/NoteAttachmentsTrait.php
@@ -11,7 +11,7 @@
  */
 trait NoteAttachmentsTrait
 {
-    private $_attachments = [
+    private array $_attachments = [
         'add' => [],
         'delete' => [],
         'create' => [],
@@ -26,7 +26,7 @@ protected function getAttachmentsLinkField(): string
      * Reset the attachments link to default blank values
      * @return $this
      */
-    public function resetAttachments()
+    public function resetAttachments(): static
     {
         $this->_attachments = [
             'add' => [],
diff --git a/tests/Endpoint/AbstractSugarBeanEndpointTest.php b/tests/Endpoint/AbstractSugarBeanEndpointTest.php
index 5edc572..cd5de09 100644
--- a/tests/Endpoint/AbstractSugarBeanEndpointTest.php
+++ b/tests/Endpoint/AbstractSugarBeanEndpointTest.php
@@ -7,6 +7,7 @@
 namespace Sugarcrm\REST\Tests\Endpoint;
 
 use PHPUnit\Framework\TestCase;
+use Sugarcrm\REST\Endpoint\Abstracts\AbstractSugarBeanEndpoint;
 use Sugarcrm\REST\Endpoint\AuditLog;
 use Sugarcrm\REST\Endpoint\Data\FilterData;
 use MRussell\REST\Exception\Endpoint\InvalidRequest;
@@ -51,6 +52,15 @@ public function testCompileRequest(): void
         $this->assertEquals("GET", $Request->getMethod());
         $this->assertEquals('http://localhost/rest/v11/Foo/bar', $Request->getUri()->__toString());
         $this->assertEmpty($Request->getBody()->getContents());
+
+        $Bean->setUrlArgs(['Accounts','12345']);
+        $Bean->setCurrentAction(AbstractSugarBeanEndpoint::BEAN_ACTION_UPSERT);
+
+        $Bean->sync_key = '67890';
+        $Request = $Bean->compileRequest();
+        $this->assertEquals("PATCH", $Request->getMethod());
+        $this->assertEquals('http://localhost/rest/v11/Accounts/sync_key/67890', $Request->getUri()->__toString());
+        $this->assertNotEmpty($Request->getBody()->getContents());
     }
 
     /**
@@ -756,4 +766,55 @@ public function testDownloadFile(): void
         $this->assertEquals("test", file_get_contents($Bean->getDownloadedFile()));
         unlink($Bean->getDownloadedFile());
     }
+
+    /**
+     * @covers ::configureAction
+     * @covers ::configurePayload
+     * @covers ::parseResponse
+     */
+    public function testUpsertAction(): void
+    {
+        $this->client->mockResponses->append(new Response(201, [], json_encode(['record' => '12345'])));
+        $Bean = new SugarBean();
+        $Bean->setClient($this->client);
+        $Bean->setModule('Accounts');
+        $Bean->set([
+            'name' => 'Test Account',
+            'account_type' => 'Prospect',
+            'sync_key' => '098765',
+        ]);
+        $Bean->upsert();
+
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('upsert', $Bean->getCurrentAction());
+        $this->assertEquals('/rest/v11/Accounts/sync_key/098765', $request->getUri()->getPath());
+        $this->assertEquals('PATCH', $request->getMethod());
+        $payload = $request->getBody()->getContents();
+        $this->assertEquals([
+            'name' => 'Test Account',
+            'account_type' => 'Prospect',
+            'sync_key' => '098765',
+            'sync_key_field_value' => '098765',
+        ], json_decode($payload, true));
+        $this->assertEquals('12345', $Bean->id);
+
+        $this->client->mockResponses->append(new Response(201, [], json_encode(['record' => ['test' => 'foobar']])));
+        $Bean->getData()['fields'] = ['test'];
+        $Bean->upsert();
+
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('/rest/v11/Accounts/sync_key/098765', $request->getUri()->getPath());
+        $this->assertEquals('PATCH', $request->getMethod());
+        $payload = $request->getBody()->getContents();
+        $this->assertEquals([
+            'id' => '12345',
+            'name' => 'Test Account',
+            'account_type' => 'Prospect',
+            'sync_key' => '098765',
+            'sync_key_field_value' => '098765',
+            'fields' => ['test'],
+        ], json_decode($payload, true));
+        $this->assertEquals('12345', $Bean->id);
+        $this->assertEquals('foobar', $Bean->test);
+    }
 }
diff --git a/tests/Endpoint/IntegrateTest.php b/tests/Endpoint/IntegrateTest.php
index 5ad22df..9ef5bc0 100644
--- a/tests/Endpoint/IntegrateTest.php
+++ b/tests/Endpoint/IntegrateTest.php
@@ -64,6 +64,42 @@ public function testConfigureAction(): void
         $this->assertEquals(Integrate::INTEGRATE_ACTION_DELETE, $endpoint->getCurrentAction());
     }
 
+    public function testUpsert(): void
+    {
+        $this->client->mockResponses->append(new Response('201', [], json_encode(['record' => '12345'])));
+        $endpoint = new Integrate();
+        $endpoint->setClient($this->client);
+        $endpoint->setModule('Accounts');
+        $endpoint['name'] = 'Test Account';
+        $endpoint['sync_key'] = 'test';
+        $endpoint->upsert();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('PATCH', $request->getMethod());
+        $this->assertEquals('/rest/v11/integrate/Accounts', $request->getUri()->getPath());
+        $body = json_decode($request->getBody()->getContents(), true);
+        $this->assertNotEmpty($body);
+        $this->assertEquals('test', $body[Integrate::DATA_SYNC_KEY_VALUE]);
+        $this->assertEquals('test', $endpoint->getSyncKey());
+        $this->assertEquals('12345', $endpoint->getId());
+
+        $this->client->mockResponses->append(new Response('201', [], json_encode(['record' => ['foobar_c' => 'test', 'account_type' => 'Prospect']])));
+        $endpoint->setSyncKeyField('sync_key');
+        $endpoint->getData()['fields'] = 'foobar_c,account_type';
+        $endpoint->upsert();
+        $request = $this->client->mockResponses->getLastRequest();
+        $this->assertEquals('PATCH', $request->getMethod());
+        $this->assertEquals('/rest/v11/integrate/Accounts/sync_key/test', $request->getUri()->getPath());
+        $body = json_decode($request->getBody()->getContents(), true);
+        $this->assertNotEmpty($body);
+        $this->assertEquals('test', $body[Integrate::DATA_SYNC_KEY_VALUE]);
+        $this->assertEquals('12345', $body['id']);
+        $this->assertEquals('foobar_c,account_type', $body['fields']);
+        $this->assertEquals('test', $endpoint->getSyncKey());
+        $this->assertEquals('12345', $endpoint->getId());
+        $this->assertEquals('test', $endpoint->foobar_c);
+        $this->assertEquals('Prospect', $endpoint['account_type']);
+    }
+
     /**
      * @covers ::getSyncKey
      * @covers ::getSyncKeyField
@@ -161,6 +197,7 @@ public function testGetBySyncKey(): void
         $this->client->mockResponses->append(new Response('200', [], json_encode($this->responsePayload)));
         $endpoint->setCurrentAction(Integrate::MODEL_ACTION_RETRIEVE);
         $endpoint->execute();
+
         $request = $this->client->mockResponses->getLastRequest();
         $this->assertEquals('GET', $request->getMethod());
         $this->assertEquals('/rest/v11/integrate/Accounts', $request->getUri()->getPath());
diff --git a/tests/Endpoint/NoteTest.php b/tests/Endpoint/NoteTest.php
index dbd917b..69520d8 100644
--- a/tests/Endpoint/NoteTest.php
+++ b/tests/Endpoint/NoteTest.php
@@ -36,6 +36,8 @@ protected function tearDown(): void
     }
 
     /**
+     * @covers \Sugarcrm\REST\Endpoint\Traits\NoteAttachmentsTrait::resetAttachments
+     * @covers \Sugarcrm\REST\Endpoint\Traits\NoteAttachmentsTrait::getAttachmentsLinkField
      * @covers ::resetAttachments
      * @covers ::deleteAttachments
      * @covers ::clear
@@ -120,6 +122,8 @@ public function testParseFiles(): void
      * @covers ::multiAttach
      * @covers ::parseResponse
      * @covers ::configurePayload
+     * @covers \Sugarcrm\REST\Endpoint\Traits\NoteAttachmentsTrait::configureAttachmentsPayload
+     * @covers \Sugarcrm\REST\Endpoint\Traits\NoteAttachmentsTrait::parseAttachmentUploadResponse
      * @covers ::configureUrl
      */
     public function testMultiattach(): void