diff --git a/src/AbstractDocument.php b/src/AbstractDocument.php
new file mode 100644
index 0000000..f6f9275
--- /dev/null
+++ b/src/AbstractDocument.php
@@ -0,0 +1,69 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi;
+
+/**
+ * abstract document
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+abstract class AbstractDocument implements DocumentInterface
+{
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    abstract protected function getFields(): array;
+
+    /**
+     * to json
+     *
+     * @return string
+     */
+    public function toJson(): string
+    {
+        $document = [];
+
+        foreach ($this->getFields() as $field) {
+            $value = $this->$field;
+
+            if (is_null($value)) {
+                continue;
+            }
+
+            if (is_array($value)) {
+                foreach (array_keys($value) as $key) {
+                    $document[sprintf('%1$s.%2$s', $field, $key)] = $value[$key];
+                }
+
+                continue;
+            }
+
+            $document[$this->toSnakeCase($field)] = $this->$field;
+        }
+
+        return json_encode($document);
+    }
+
+    /**
+     * to snake case
+     *
+     * @param string $string
+     *
+     * @return string
+     */
+    private function toSnakeCase(string $string): string
+    {
+        return mb_strtolower(preg_replace('/(.)(?=[A-Z])/', '$1_', $string));
+    }
+}
diff --git a/src/Document/Api.php b/src/Document/Api.php
new file mode 100644
index 0000000..dd2db18
--- /dev/null
+++ b/src/Document/Api.php
@@ -0,0 +1,219 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Document;
+
+use Unikorp\KongAdminApi\AbstractDocument;
+
+/**
+ * api
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class Api extends AbstractDocument
+{
+    /**
+     * name
+     * @var string $name
+     */
+    protected $name = null;
+
+    /**
+     * request host
+     * @var string $requestHost
+     */
+    protected $requestHost = null;
+
+    /**
+     * request path
+     * @var string $requestPath
+     */
+    protected $requestPath = null;
+
+    /**
+     * strip request path
+     * @var bool $stripRequestPath
+     */
+    protected $stripRequestPath = false;
+
+    /**
+     * preserve host
+     * @var bool $preserveHost
+     */
+    protected $preserveHost = false;
+
+    /**
+     * upstream url
+     * @var string $upstreamUrl
+     */
+    protected $upstreamUrl = null;
+
+    /**
+     * set name
+     *
+     * @param string $name
+     *
+     * @return this
+     */
+    public function setName(string $name): self
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    /**
+     * get name
+     *
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * set request host
+     *
+     * @param string $requestHost
+     *
+     * @return this
+     */
+    public function setRequestHost(string $requestHost): self
+    {
+        $this->requestHost = $requestHost;
+
+        return $this;
+    }
+
+    /**
+     * get request host
+     *
+     * @return string
+     */
+    public function getRequestHost(): string
+    {
+        return $this->requestHost;
+    }
+
+    /**
+     * set request path
+     *
+     * @param string $requestPath
+     *
+     * @return this
+     */
+    public function setRequestPath(string $requestPath): self
+    {
+        $this->requestPath = $requestPath;
+
+        return $this;
+    }
+
+    /**
+     * get request path
+     *
+     * @return string
+     */
+    public function getRequestPath(): string
+    {
+        return $this->requestPath;
+    }
+
+    /**
+     * set strip request path
+     *
+     * @param bool $stripRequestPath
+     *
+     * @return this
+     */
+    public function setStripRequestPath(bool $stripRequestPath): self
+    {
+        $this->stripRequestPath = $stripRequestPath;
+
+        return $this;
+    }
+
+    /**
+     * get strip request path
+     *
+     * @return bool
+     */
+    public function getStripRequestPath(): bool
+    {
+        return $this->stripRequestPath;
+    }
+
+    /**
+     * set preserve host
+     *
+     * @param bool $preserveHost
+     *
+     * @return this
+     */
+    public function setPreserveHost(bool $preserveHost): self
+    {
+        $this->preserveHost = $preserveHost;
+
+        return $this;
+    }
+
+    /**
+     * get preserve host
+     *
+     * @return bool
+     */
+    public function getPreserveHost(): bool
+    {
+        return $this->preserveHost;
+    }
+
+    /**
+     * set upstream url
+     *
+     * @param string $upstreamUrl
+     *
+     * @return this
+     */
+    public function setUpstreamUrl(string $upstreamUrl): self
+    {
+        $this->upstreamUrl = $upstreamUrl;
+
+        return $this;
+    }
+
+    /**
+     * get upstream url
+     *
+     * @return string
+     */
+    public function getUpstreamUrl(): string
+    {
+        return $this->upstreamUrl;
+    }
+
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    protected function getFields(): array
+    {
+        return [
+            'name',
+            'requestHost',
+            'requestPath',
+            'stripRequestPath',
+            'preserveHost',
+            'upstreamUrl',
+        ];
+    }
+}
diff --git a/src/Document/Cluster.php b/src/Document/Cluster.php
new file mode 100644
index 0000000..055c121
--- /dev/null
+++ b/src/Document/Cluster.php
@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Document;
+
+use Unikorp\KongAdminApi\AbstractDocument;
+
+/**
+ * cluster
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class Cluster extends AbstractDocument
+{
+    /**
+     * name
+     * @var string $name
+     */
+    protected $name = null;
+
+    /**
+     * set name
+     *
+     * @param string $name
+     *
+     * @return this
+     */
+    public function setName(string $name): self
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    /**
+     * get name
+     *
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    protected function getFields(): array
+    {
+        return [
+            'name',
+        ];
+    }
+}
diff --git a/src/Document/Consumer.php b/src/Document/Consumer.php
new file mode 100644
index 0000000..f5ab237
--- /dev/null
+++ b/src/Document/Consumer.php
@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Document;
+
+use Unikorp\KongAdminApi\AbstractDocument;
+
+/**
+ * consumer
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class Consumer extends AbstractDocument
+{
+    /**
+     * username
+     * @var string $username
+     */
+    protected $username = null;
+
+    /**
+     * custom id
+     * @var string $customId
+     */
+    protected $customId = null;
+
+    /**
+     * set username
+     *
+     * @param string $username
+     *
+     * @return this
+     */
+    public function setUsername(string $username): self
+    {
+        $this->username = $username;
+
+        return $this;
+    }
+
+    /**
+     * get username
+     *
+     * @return string
+     */
+    public function getUsername(): string
+    {
+        return $this->username;
+    }
+
+    /**
+     * set custom id
+     *
+     * @param string $customId
+     *
+     * @return this
+     */
+    public function setCustomId(string $customId): self
+    {
+        $this->customId = $customId;
+
+        return $this;
+    }
+
+    /**
+     * get custom id
+     *
+     * @return string
+     */
+    public function getCustomId(): string
+    {
+        return $this->customId;
+    }
+
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    protected function getFields(): array
+    {
+        return [
+            'username',
+            'customId',
+        ];
+    }
+}
diff --git a/src/Document/Information.php b/src/Document/Information.php
new file mode 100644
index 0000000..2dd4703
--- /dev/null
+++ b/src/Document/Information.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Document;
+
+use Unikorp\KongAdminApi\AbstractDocument;
+
+/**
+ * information
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class Information extends AbstractDocument
+{
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    protected function getFields(): array
+    {
+        return [];
+    }
+}
diff --git a/src/Document/Plugin.php b/src/Document/Plugin.php
new file mode 100644
index 0000000..c47e84b
--- /dev/null
+++ b/src/Document/Plugin.php
@@ -0,0 +1,149 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Document;
+
+use Unikorp\KongAdminApi\AbstractDocument;
+
+/**
+ * plugin
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class Plugin extends AbstractDocument
+{
+    /**
+     * name
+     * @var string $name
+     */
+    protected $name = null;
+
+    /**
+     * consumer id
+     * @var string $consumerId
+     */
+    protected $consumerId = null;
+
+    /**
+     * config
+     * @var array $config
+     */
+    protected $config = [];
+
+    /**
+     * set name
+     *
+     * @param string $name
+     *
+     * @return this
+     */
+    public function setName(string $name): self
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    /**
+     * get name
+     *
+     * @return string
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * set consumer id
+     *
+     * @param string $consumerId
+     *
+     * @return this
+     */
+    public function setConsumerId(string $consumerId): self
+    {
+        $this->consumerId = $consumerId;
+
+        return $this;
+    }
+
+    /**
+     * get consumer id
+     *
+     * @return string
+     */
+    public function getConsumerId(): string
+    {
+        return $this->consumerId;
+    }
+
+    /**
+     * add config
+     *
+     * @param string $name
+     * @param mixed $value
+     *
+     * @return this
+     */
+    public function addConfig(string $name, $value): self
+    {
+        if (isset($this->config[$name])) {
+            throw new \RuntimeException(sprintf('Config for name `%1$s` already set', $name));
+        }
+
+        $this->config[$name] = $value;
+
+        return $this;
+    }
+
+    /**
+     * remove config
+     *
+     * @param string $name
+     *
+     * @return this
+     */
+    public function removeConfig(string $name): self
+    {
+        if (isset($this->config[$name])) {
+            unset($this->config[$name]);
+        }
+
+        return $this;
+    }
+
+    /**
+     * get config
+     *
+     * @param string $name
+     *
+     * @return mixed
+     */
+    public function getConfig(string $name)
+    {
+        return $this->config[$name];
+    }
+
+    /**
+     * get fields
+     *
+     * @return array
+     */
+    protected function getFields(): array
+    {
+        return [
+            'name',
+            'consumerId',
+            'config',
+        ];
+    }
+}
diff --git a/src/DocumentInterface.php b/src/DocumentInterface.php
new file mode 100644
index 0000000..6ca9a75
--- /dev/null
+++ b/src/DocumentInterface.php
@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi;
+
+/**
+ * document interface
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+interface DocumentInterface
+{
+    /**
+     * to json
+     *
+     * @return string
+     */
+    public function toJson(): string;
+}
diff --git a/tests/Document/ApiTest.php b/tests/Document/ApiTest.php
new file mode 100644
index 0000000..a3e6e4c
--- /dev/null
+++ b/tests/Document/ApiTest.php
@@ -0,0 +1,287 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Tests\Document;
+
+use Unikorp\KongAdminApi\Document\Api as Document;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * api test
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class ApiTest extends TestCase
+{
+    /**
+     * document
+     * @var \Unikorp\KongAdminApi\Document\Api $document
+     */
+    private $document = null;
+
+    /**
+     * set up
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function setUp()
+    {
+        $this->document = new Document();
+    }
+
+    /**
+     * tear down
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function tearDown()
+    {
+        $this->document = null;
+    }
+
+    /**
+     * test set name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setName
+     */
+    public function testSetName()
+    {
+        // asserts
+        $this->document->setName('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'name'));
+    }
+
+    /**
+     * test get name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getName
+     */
+    public function testGetName()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `name` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('name');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getName());
+    }
+
+    /**
+     * test set request host
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setRequestHost
+     */
+    public function testSetRequestHost()
+    {
+        // asserts
+        $this->document->setRequestHost('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'requestHost'));
+    }
+
+    /**
+     * test get request host
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getRequestHost
+     */
+    public function testGetRequestHost()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `request host` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('requestHost');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getRequestHost());
+    }
+
+    /**
+     * test set request path
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setRequestPath
+     */
+    public function testSetRequestPath()
+    {
+        // asserts
+        $this->document->setRequestPath('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'requestPath'));
+    }
+
+    /**
+     * test get request path
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getRequestPath
+     */
+    public function testGetRequestPath()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `request path` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('requestPath');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getRequestPath());
+    }
+
+    /**
+     * test set strip request path
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setStripRequestPath
+     */
+    public function testSetStripRequestPath()
+    {
+        // asserts
+        $this->document->setStripRequestPath(true);
+        $this->assertSame(true, $this->readAttribute($this->document, 'stripRequestPath'));
+    }
+
+    /**
+     * test get strip request path
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getStripRequestPath
+     */
+    public function testGetStripRequestPath()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `strip request path` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('stripRequestPath');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, true);
+        $this->assertSame(true, $this->document->getStripRequestPath());
+    }
+
+    /**
+     * test set preserve host
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setPreserveHost
+     */
+    public function testSetPreserveHost()
+    {
+        // asserts
+        $this->document->setPreserveHost(true);
+        $this->assertSame(true, $this->readAttribute($this->document, 'preserveHost'));
+    }
+
+    /**
+     * test get preserve host
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getPreserveHost
+     */
+    public function testGetPreserveHost()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `preserve host` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('preserveHost');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, true);
+        $this->assertSame(true, $this->document->getPreserveHost());
+    }
+
+    /**
+     * test set upstream url
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::setUpstreamUrl
+     */
+    public function testSetUpstreamUrl()
+    {
+        // asserts
+        $this->document->setUpstreamUrl('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'upstreamUrl'));
+    }
+
+    /**
+     * test get upstream url
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Api::getUpstreamUrl
+     */
+    public function testGetUpstreamUrl()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `upstream url` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('upstreamUrl');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getUpstreamUrl());
+    }
+
+    /**
+     * test to json
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toJson
+     * @covers \Unikorp\KongAdminApi\Document\Api::getFields
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toSnakeCase
+     */
+    public function testToJson()
+    {
+        $this->document
+            ->setName('name')
+            ->setRequestHost('requestHost')
+            ->setStripRequestPath(true)
+            ->setPreserveHost(true)
+            ->setUpstreamUrl('upstreamUrl');
+
+        $this->assertSame(
+            '{"name":"name","request_host":"requestHost","strip_request_path":true,"preserve_host":true,"upstream_url":"upstreamUrl"}',
+            $this->document->toJson()
+        );
+    }
+}
diff --git a/tests/Document/ClusterTest.php b/tests/Document/ClusterTest.php
new file mode 100644
index 0000000..1212e92
--- /dev/null
+++ b/tests/Document/ClusterTest.php
@@ -0,0 +1,105 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Tests\Document;
+
+use Unikorp\KongAdminApi\Document\Cluster as Document;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * cluster test
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class ClusterTest extends TestCase
+{
+    /**
+     * document
+     * @var \Unikorp\KongAdminApi\Document\Cluster $document
+     */
+    private $document = null;
+
+    /**
+     * set up
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function setUp()
+    {
+        $this->document = new Document();
+    }
+
+    /**
+     * tear down
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function tearDown()
+    {
+        $this->document = null;
+    }
+
+    /**
+     * test set name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Cluster::setName
+     */
+    public function testSetName()
+    {
+        // asserts
+        $this->document->setName('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'name'));
+    }
+
+    /**
+     * test get name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Cluster::getName
+     */
+    public function testGetName()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `name` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('name');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getName());
+    }
+
+    /**
+     * test to json
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toJson
+     * @covers \Unikorp\KongAdminApi\Document\Cluster::getFields
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toSnakeCase
+     */
+    public function testToJson()
+    {
+        $this->document
+            ->setName('name');
+
+        $this->assertSame('{"name":"name"}', $this->document->toJson());
+    }
+}
diff --git a/tests/Document/ConsumerTest.php b/tests/Document/ConsumerTest.php
new file mode 100644
index 0000000..60c754c
--- /dev/null
+++ b/tests/Document/ConsumerTest.php
@@ -0,0 +1,148 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Tests\Document;
+
+use Unikorp\KongAdminApi\Document\Consumer as Document;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * consumer test
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class ConsumerTest extends TestCase
+{
+    /**
+     * document
+     * @var \Unikorp\KongAdminApi\Document\Consumer $document
+     */
+    private $document = null;
+
+    /**
+     * set up
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function setUp()
+    {
+        $this->document = new Document();
+    }
+
+    /**
+     * tear down
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function tearDown()
+    {
+        $this->document = null;
+    }
+
+    /**
+     * test set username
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Consumer::setUsername
+     */
+    public function testSetUsername()
+    {
+        // asserts
+        $this->document->setUsername('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'username'));
+    }
+
+    /**
+     * test get username
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Consumer::getUsername
+     */
+    public function testGetUsername()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `username` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('username');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getUsername());
+    }
+
+    /**
+     * test set custom id
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Consumer::setCustomId
+     */
+    public function testCustomId()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `custom id` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('customId');
+        $reflectionProperty->setAccessible(true);
+
+        // asserts
+        $this->document->setCustomId('test');
+        $this->assertSame('test', $reflectionProperty->getValue($this->document));
+    }
+
+    /**
+     * test get custom id
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Consumer::getCustomId
+     */
+    public function testGetCustomId()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `custom id` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('customId');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getCustomId());
+    }
+
+    /**
+     * test to json
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toJson
+     * @covers \Unikorp\KongAdminApi\Document\Consumer::getFields
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toSnakeCase
+     */
+    public function testToJson()
+    {
+        $this->document
+            ->setUsername('username')
+            ->setCustomId('customId');
+
+        $this->assertSame('{"username":"username","custom_id":"customId"}', $this->document->toJson());
+    }
+}
diff --git a/tests/Document/InformationTest.php b/tests/Document/InformationTest.php
new file mode 100644
index 0000000..6cbd901
--- /dev/null
+++ b/tests/Document/InformationTest.php
@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Tests\Document;
+
+use Unikorp\KongAdminApi\Document\Information as Document;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * information test
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class InformationTest extends TestCase
+{
+    /**
+     * document
+     * @var \Unikorp\KongAdminApi\Document\Information $document
+     */
+    private $document = null;
+
+    /**
+     * set up
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function setUp()
+    {
+        $this->document = new Document();
+    }
+
+    /**
+     * tear down
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function tearDown()
+    {
+        $this->document = null;
+    }
+
+    /**
+     * test to json
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toJson
+     * @covers \Unikorp\KongAdminApi\Document\Information::getFields
+     */
+    public function testToJson()
+    {
+        $this->assertSame('[]', $this->document->toJson());
+    }
+}
diff --git a/tests/Document/PluginTest.php b/tests/Document/PluginTest.php
new file mode 100644
index 0000000..dcd2955
--- /dev/null
+++ b/tests/Document/PluginTest.php
@@ -0,0 +1,231 @@
+<?php
+
+/*
+ * This file is part of the KongAdminApi package.
+ *
+ * (c) Unikorp <https://github.com/unikorp>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unikorp\KongAdminApi\Tests\Document;
+
+use Unikorp\KongAdminApi\Document\Plugin as Document;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * plugin test
+ *
+ * @author VEBER Arnaud <https://github.com/VEBERArnaud>
+ */
+class PluginTest extends TestCase
+{
+    /**
+     * document
+     * @var \Unikorp\KongAdminApi\Document\Plugin $document
+     */
+    private $document = null;
+
+    /**
+     * set up
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function setUp()
+    {
+        $this->document = new Document();
+    }
+
+    /**
+     * tear down
+     *
+     * @return void
+     *
+     * @coversNothing
+     */
+    protected function tearDown()
+    {
+        $this->document = null;
+    }
+
+    /**
+     * test set name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::setName
+     */
+    public function testSetName()
+    {
+        // asserts
+        $this->document->setName('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'name'));
+    }
+
+    /**
+     * test get name
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::getName
+     */
+    public function testGetName()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `name` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('name');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getName());
+    }
+
+    /**
+     * test set consumer id
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::setConsumerId
+     */
+    public function testSetConsumerId()
+    {
+        // asserts
+        $this->document->setConsumerId('test');
+        $this->assertSame('test', $this->readAttribute($this->document, 'consumerId'));
+    }
+
+    /**
+     * test get consumer id
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::getConsumerId
+     */
+    public function testGetConsumerId()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `consumer id` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('consumerId');
+        $reflectionProperty->setAccessible(true);
+
+        // assert
+        $reflectionProperty->setValue($this->document, 'test');
+        $this->assertSame('test', $this->document->getConsumerId());
+    }
+
+    /**
+     * test add config
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::addConfig
+     */
+    public function testAddConfig()
+    {
+        // assert
+        $this->document
+            ->addConfig('test', 'test')
+            ->addConfig('something_else', 'something_else');
+        $this->assertSame(
+            ['test' => 'test', 'something_else' => 'something_else'],
+            $this->readAttribute($this->document, 'config')
+        );
+    }
+
+    /**
+     * test add config when name already set
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::addConfig
+     *
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage Config for name `test` already set
+     */
+    public function testAddConfigWhenNameAlreadySet()
+    {
+        // assert
+        $this->document
+            ->addConfig('test', 'first')
+            ->addConfig('test', 'second');
+    }
+
+    /**
+     * test remove config
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::removeConfig
+     */
+    public function testRemoveConfig()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `config` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('config');
+        $reflectionProperty->setAccessible(true);
+
+        $reflectionProperty->setValue(
+            $this->document,
+            ['test' => 'test', 'something_else' => 'something_else']
+        );
+
+        // assert
+        $this->document->removeConfig('test');
+        $this->assertSame(['something_else' => 'something_else'], $this->readAttribute($this->document, 'config'));
+    }
+
+    /**
+     * test get config
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::getConfig
+     */
+    public function testGetConfig()
+    {
+        // reflect `document`
+        $reflectionClass = new \ReflectionClass($this->document);
+
+        // set `config` property from `document` accessible
+        $reflectionProperty = $reflectionClass->getProperty('config');
+        $reflectionProperty->setAccessible(true);
+
+        $reflectionProperty->setValue($this->document, ['test' => 'test']);
+
+        // assert
+        $this->assertSame('test', $this->document->getConfig('test'));
+    }
+
+    /**
+     * test to json
+     *
+     * @return void
+     *
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toJson
+     * @covers \Unikorp\KongAdminApi\Document\Plugin::getFields
+     * @covers \Unikorp\KongAdminApi\AbstractDocument::toSnakeCase
+     */
+    public function testToJson()
+    {
+        $this->document
+            ->setName('name')
+            ->setConsumerId('consumerId')
+            ->addConfig('test', true)
+            ->addConfig('something_else', 'something_else');
+
+        $this->assertSame(
+            '{"name":"name","consumer_id":"consumerId","config.test":true,"config.something_else":"something_else"}',
+            $this->document->toJson()
+        );
+    }
+}