diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..114b4b3
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,16 @@
+{
+    "name": "expertlead/webflow-php-sdk",
+    "description": "PHP SDK for the Webflow CMS API",
+    "type": "library",
+    "require": {
+        "guzzlehttp/guzzle": "^5"
+    },
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Oleksii Antypov",
+            "email": "echo@wivern.co.uk"
+        }
+    ],
+    "minimum-stability": "stable"
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..8b72da7
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,218 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "074f6b855183335b50d0cb23d75f5d28",
+    "packages": [
+        {
+            "name": "guzzlehttp/guzzle",
+            "version": "5.3.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/guzzle.git",
+                "reference": "93bbdb30d59be6cd9839495306c65f2907370eb9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/93bbdb30d59be6cd9839495306c65f2907370eb9",
+                "reference": "93bbdb30d59be6cd9839495306c65f2907370eb9",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/ringphp": "^1.1",
+                "php": ">=5.4.0",
+                "react/promise": "^2.2"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "phpunit/phpunit": "^4.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Guzzle is a PHP HTTP client library and framework for building RESTful web service clients",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "client",
+                "curl",
+                "framework",
+                "http",
+                "http client",
+                "rest",
+                "web service"
+            ],
+            "time": "2018-07-31T13:33:10+00:00"
+        },
+        {
+            "name": "guzzlehttp/ringphp",
+            "version": "1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/RingPHP.git",
+                "reference": "5e2a174052995663dd68e6b5ad838afd47dd615b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/RingPHP/zipball/5e2a174052995663dd68e6b5ad838afd47dd615b",
+                "reference": "5e2a174052995663dd68e6b5ad838afd47dd615b",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/streams": "~3.0",
+                "php": ">=5.4.0",
+                "react/promise": "~2.0"
+            },
+            "require-dev": {
+                "ext-curl": "*",
+                "phpunit/phpunit": "~4.0"
+            },
+            "suggest": {
+                "ext-curl": "Guzzle will use specific adapters if cURL is present"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Ring\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Provides a simple API and specification that abstracts away the details of HTTP into a single PHP function.",
+            "time": "2018-07-31T13:22:33+00:00"
+        },
+        {
+            "name": "guzzlehttp/streams",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/streams.git",
+                "reference": "47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/streams/zipball/47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5",
+                "reference": "47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Stream\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                }
+            ],
+            "description": "Provides a simple abstraction over streams of data",
+            "homepage": "http://guzzlephp.org/",
+            "keywords": [
+                "Guzzle",
+                "stream"
+            ],
+            "time": "2014-10-12T19:18:40+00:00"
+        },
+        {
+            "name": "react/promise",
+            "version": "v2.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/promise.git",
+                "reference": "f4edc2581617431aea50430749db55cc3fc031b3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/reactphp/promise/zipball/f4edc2581617431aea50430749db55cc3fc031b3",
+                "reference": "f4edc2581617431aea50430749db55cc3fc031b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\Promise\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jan Sorgalla",
+                    "email": "jsorgalla@gmail.com"
+                }
+            ],
+            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
+            "keywords": [
+                "promise",
+                "promises"
+            ],
+            "time": "2018-06-13T15:59:06+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/src/Webflow/Api.php b/src/Webflow/Api.php
new file mode 100644
index 0000000..0586bbb
--- /dev/null
+++ b/src/Webflow/Api.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace Webflow;
+
+use Webflow\WebflowException;
+use GuzzleHttp\Client;
+
+class Api {
+
+  const WEBFLOW_API_ENDPOINT = 'https://api.webflow.com';
+
+  private $client;
+
+  function __construct(
+      $token,
+      $version = '1.0.0'
+  ) {
+      if (empty($token)) {
+        throw new WebflowException('token');
+      }
+
+      $this->client = new Client([
+        'base_uri' => self::WEBFLOW_API_ENDPOINT,
+        'headers' => [
+          'Authorization' => "Bearer {$token}",
+          'accept-version' => $version,
+          'Accept' => 'application/json',
+          'Content-Type' => 'application/json',
+        ]
+      ]);
+
+      return $this;
+  }
+
+  // Meta
+
+  public function info() {
+    return $this->client->get('/info')->getBody();
+  }
+
+  public function sites() {
+    return $this->client->get('/sites')->getBody();
+  }
+
+  public function site(string $siteId) {
+    return $this->client->get("/sites/{$siteId}")->getBody();
+  }
+
+  public function domains(string $siteId) {
+    return $this->client->get("/sites/{$siteId}/domains")->getBody();
+  }
+
+  public function publishSite(string $siteId, array $domains) {
+    return $this->client->post(`/sites/${siteId}/publish`, $domains);
+  }
+
+  // Collections
+
+  public function collections(string $siteId) {
+    return $this->client->get("/sites/{$siteId}/collections")->getBody();
+  }
+
+  public function collection(string $collectionId) {
+    return $this->client->get("/collections/{$collectionId}")->getBody();
+  }
+
+  // Items
+
+  public function items(string $collectionId) {
+    return $this->client->get("/collections/{$collectionId}/items")->getBody();
+  }
+
+  public function item(string $collectionId, string $itemId) {
+    return $this->client->get("/collections/{$collectionId}/items/{$itemId}")->getBody();
+  }
+
+  public function createItem(string $collectionId, array $data) {
+    return $this->client->post("/collections/{$collectionId}/items", [
+        'json' => [
+            'fields' => $data,
+        ],
+    ])->getBody();
+  }
+
+  public function updateItem(string $collectionId, string $itemId, array $data) {
+    return $this->client->put("/collections/{$collectionId}/items/{$itemId}", $data);
+  }
+
+  public function removeItem(string $collectionId, $itemId) {
+    return $this->client->delete("/collections/{$collectionId}/items/{$itemId}")->getBody();
+  }
+
+}
diff --git a/src/Webflow/WebflowException.php b/src/Webflow/WebflowException.php
new file mode 100644
index 0000000..547f790
--- /dev/null
+++ b/src/Webflow/WebflowException.php
@@ -0,0 +1,8 @@
+<?php
+
+class WebflowException extends Exception {
+   public function __construct(string $argument){
+     $this->message = "Argument '{$argument}' is required but was not present";
+     return $this;
+   }
+}