diff --git a/.gitattributes b/.gitattributes
index 51aa9279117..61739dd0a85 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,4 @@
 /.* export-ignore
-classmap.php.bak export-ignore
 phpcs.xml export-ignore
 phpunit.* export-ignore
 unit-tests export-ignore
diff --git a/classmap.php b/classmap.php
deleted file mode 100644
index 1120d34c766..00000000000
--- a/classmap.php
+++ /dev/null
@@ -1,104 +0,0 @@
-<?php
-
-// autoload_classmap.php @generated by Composer
-
-$vendorDir = dirname(dirname(__FILE__));
-$baseDir = __DIR__;
-
-return array(
-    'WC_REST_CRUD_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-crud-controller.php',
-    'WC_REST_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-controller.php',
-    'WC_REST_Coupons_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-coupons-controller.php',
-    'WC_REST_Coupons_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-coupons-v1-controller.php',
-    'WC_REST_Coupons_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-coupons-v2-controller.php',
-    'WC_REST_Customer_Downloads_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-customer-downloads-controller.php',
-    'WC_REST_Customer_Downloads_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-customer-downloads-v1-controller.php',
-    'WC_REST_Customer_Downloads_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-customer-downloads-v2-controller.php',
-    'WC_REST_Customers_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-customers-controller.php',
-    'WC_REST_Customers_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-customers-v1-controller.php',
-    'WC_REST_Customers_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-customers-v2-controller.php',
-    'WC_REST_Data_Continents_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-data-continents-controller.php',
-    'WC_REST_Data_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-data-controller.php',
-    'WC_REST_Data_Countries_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-data-countries-controller.php',
-    'WC_REST_Data_Currencies_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-data-currencies-controller.php',
-    'WC_REST_Network_Orders_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-network-orders-controller.php',
-    'WC_REST_Network_Orders_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-network-orders-v2-controller.php',
-    'WC_REST_Order_Notes_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-order-notes-controller.php',
-    'WC_REST_Order_Notes_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-order-notes-v1-controller.php',
-    'WC_REST_Order_Notes_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-order-notes-v2-controller.php',
-    'WC_REST_Order_Refunds_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-order-refunds-controller.php',
-    'WC_REST_Order_Refunds_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-order-refunds-v1-controller.php',
-    'WC_REST_Order_Refunds_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-order-refunds-v2-controller.php',
-    'WC_REST_Orders_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-orders-controller.php',
-    'WC_REST_Orders_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-orders-v1-controller.php',
-    'WC_REST_Orders_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-orders-v2-controller.php',
-    'WC_REST_Payment_Gateways_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-payment-gateways-controller.php',
-    'WC_REST_Payment_Gateways_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-payment-gateways-v2-controller.php',
-    'WC_REST_Posts_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-posts-controller.php',
-    'WC_REST_Product_Attribute_Terms_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-attribute-terms-controller.php',
-    'WC_REST_Product_Attribute_Terms_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-attribute-terms-v1-controller.php',
-    'WC_REST_Product_Attribute_Terms_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-attribute-terms-v2-controller.php',
-    'WC_REST_Product_Attributes_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-attributes-controller.php',
-    'WC_REST_Product_Attributes_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-attributes-v1-controller.php',
-    'WC_REST_Product_Attributes_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-attributes-v2-controller.php',
-    'WC_REST_Product_Categories_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-categories-controller.php',
-    'WC_REST_Product_Categories_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-categories-v1-controller.php',
-    'WC_REST_Product_Categories_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-categories-v2-controller.php',
-    'WC_REST_Product_Reviews_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-reviews-controller.php',
-    'WC_REST_Product_Reviews_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-reviews-v1-controller.php',
-    'WC_REST_Product_Reviews_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-reviews-v2-controller.php',
-    'WC_REST_Product_Shipping_Classes_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-shipping-classes-controller.php',
-    'WC_REST_Product_Shipping_Classes_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-shipping-classes-v1-controller.php',
-    'WC_REST_Product_Shipping_Classes_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-shipping-classes-v2-controller.php',
-    'WC_REST_Product_Tags_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-tags-controller.php',
-    'WC_REST_Product_Tags_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-product-tags-v1-controller.php',
-    'WC_REST_Product_Tags_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-tags-v2-controller.php',
-    'WC_REST_Product_Variations_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-product-variations-controller.php',
-    'WC_REST_Product_Variations_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-product-variations-v2-controller.php',
-    'WC_REST_Products_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-products-controller.php',
-    'WC_REST_Products_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-products-v1-controller.php',
-    'WC_REST_Products_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-products-v2-controller.php',
-    'WC_REST_Report_Coupons_Totals_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-coupons-totals-controller.php',
-    'WC_REST_Report_Customers_Totals_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-customers-totals-controller.php',
-    'WC_REST_Report_Orders_Totals_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-orders-totals-controller.php',
-    'WC_REST_Report_Products_Totals_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-products-totals-controller.php',
-    'WC_REST_Report_Reviews_Totals_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-reviews-totals-controller.php',
-    'WC_REST_Report_Sales_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-sales-controller.php',
-    'WC_REST_Report_Sales_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-report-sales-v1-controller.php',
-    'WC_REST_Report_Sales_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-report-sales-v2-controller.php',
-    'WC_REST_Report_Top_Sellers_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-report-top-sellers-controller.php',
-    'WC_REST_Report_Top_Sellers_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-report-top-sellers-v1-controller.php',
-    'WC_REST_Report_Top_Sellers_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-report-top-sellers-v2-controller.php',
-    'WC_REST_Reports_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-reports-controller.php',
-    'WC_REST_Reports_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-reports-v1-controller.php',
-    'WC_REST_Reports_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-reports-v2-controller.php',
-    'WC_REST_Setting_Options_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-setting-options-controller.php',
-    'WC_REST_Setting_Options_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-setting-options-v2-controller.php',
-    'WC_REST_Settings_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-settings-controller.php',
-    'WC_REST_Settings_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-settings-v2-controller.php',
-    'WC_REST_Shipping_Methods_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-shipping-methods-controller.php',
-    'WC_REST_Shipping_Methods_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-shipping-methods-v2-controller.php',
-    'WC_REST_Shipping_Zone_Locations_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-shipping-zone-locations-controller.php',
-    'WC_REST_Shipping_Zone_Locations_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-shipping-zone-locations-v2-controller.php',
-    'WC_REST_Shipping_Zone_Methods_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-shipping-zone-methods-controller.php',
-    'WC_REST_Shipping_Zone_Methods_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-shipping-zone-methods-v2-controller.php',
-    'WC_REST_Shipping_Zones_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-shipping-zones-controller.php',
-    'WC_REST_Shipping_Zones_Controller_Base' => $baseDir . '/src/Controllers/Version3/class-wc-rest-shipping-zones-controller-base.php',
-    'WC_REST_Shipping_Zones_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-shipping-zones-v2-controller.php',
-    'WC_REST_System_Status_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-system-status-controller.php',
-    'WC_REST_System_Status_Tools_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-system-status-tools-controller.php',
-    'WC_REST_System_Status_Tools_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-system-status-tools-v2-controller.php',
-    'WC_REST_System_Status_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-system-status-v2-controller.php',
-    'WC_REST_Tax_Classes_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-tax-classes-controller.php',
-    'WC_REST_Tax_Classes_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-tax-classes-v1-controller.php',
-    'WC_REST_Tax_Classes_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-tax-classes-v2-controller.php',
-    'WC_REST_Taxes_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-taxes-controller.php',
-    'WC_REST_Taxes_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-taxes-v1-controller.php',
-    'WC_REST_Taxes_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-taxes-v2-controller.php',
-    'WC_REST_Terms_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-terms-controller.php',
-    'WC_REST_Webhook_Deliveries_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-webhook-deliveries-v1-controller.php',
-    'WC_REST_Webhook_Deliveries_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-webhook-deliveries-v2-controller.php',
-    'WC_REST_Webhooks_Controller' => $baseDir . '/src/Controllers/Version3/class-wc-rest-webhooks-controller.php',
-    'WC_REST_Webhooks_V1_Controller' => $baseDir . '/src/Controllers/Version1/class-wc-rest-webhooks-v1-controller.php',
-    'WC_REST_Webhooks_V2_Controller' => $baseDir . '/src/Controllers/Version2/class-wc-rest-webhooks-v2-controller.php',
-);
diff --git a/composer.json b/composer.json
index 83275842339..1d95ffbf90f 100644
--- a/composer.json
+++ b/composer.json
@@ -8,8 +8,7 @@
   "minimum-stability": "dev",
   "require-dev": {
     "phpunit/phpunit": "6.5.14",
-    "woocommerce/woocommerce-sniffs": "0.0.6",
-    "slowprog/composer-copy-file": "~0.3"
+    "woocommerce/woocommerce-sniffs": "0.0.6"
   },
   "scripts": {
     "post-install-cmd": [
@@ -17,12 +16,6 @@
     ],
     "post-update-cmd": [
       "composer dump-autoload"
-    ],
-    "pre-autoload-dump": [
-      "composer dump-autoload --no-dev --no-scripts",
-      "SlowProg\\CopyFile\\ScriptHandler::copy",
-      "sed -i.bak -e 's/\\$baseDir = dirname(\\$vendorDir)/\\$baseDir = __DIR__/g' classmap.php",
-      "rm classmap.php.bak"
     ]
   },
   "autoload": {
@@ -30,14 +23,9 @@
       "src/Controllers/Version1",
       "src/Controllers/Version2",
       "src/Controllers/Version3"
-    ]
-  },
-  "extra": {
-    "copy-file": {
-        "vendor/composer/autoload_classmap.php": "classmap.php"
-    },
-    "copy-file-dev": {
-      "vendor/composer/autoload_classmap.php": "classmap.php"
+    ],
+    "psr-4": {
+      "WooCommerce\\RestApi\\": "src/"
     }
   }
 }
diff --git a/init.php b/init.php
index 76f449f9bea..63e89eeb4ca 100644
--- a/init.php
+++ b/init.php
@@ -6,12 +6,9 @@
  */
 
 return function() {
-	if ( file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
-		require __DIR__ . '/vendor/autoload.php';
-	} else {
-		require __DIR__ . '/src/Autoloader.php';
-		$classmap = require 'classmap.php';
-		\WooCommerce\RestApi\Autoloader::register( $classmap );
+	if ( ! file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
+		return;
 	}
+	require __DIR__ . '/vendor/autoload.php';
 	\WooCommerce\RestApi\Server::instance()->init();
 };
diff --git a/src/Autoloader.php b/src/Autoloader.php
deleted file mode 100644
index 805b072ebbb..00000000000
--- a/src/Autoloader.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-/**
- * Custom Autoloader used when included inside another project as a package.
- *
- * Since this package can be included multiple times, but we want to ensure the latest version
- * is loaded (rather than the first package found), we need a custom autoloader.
- *
- * This autoloader is only loaded for the chosen (latest) package.
- *
- * For version 4 onwards, we use psr-4 class naming.
- * For version 3 and below, we use a classmap to maintain class naming/backwards compatibility.
- *
- * @package WooCommerce/RestApi
- */
-
-namespace WooCommerce\RestApi;
-
-defined( 'ABSPATH' ) || exit;
-
-/**
- * Autoloader class.
- */
-class Autoloader {
-
-	/**
-	 * Holds the classmap.
-	 *
-	 * @var array
-	 */
-	protected static $classmap = [];
-
-	/**
-	 * Register the autoloader.
-	 *
-	 * @param array $classmap Classmap of files to include.
-	 */
-	public static function register( $classmap ) {
-		self::$classmap = (array) $classmap;
-		spl_autoload_register( array( __CLASS__, 'autoload_class' ) );
-	}
-
-	/**
-	 * Try to autoload a class.
-	 *
-	 * @param string $class Class being autoloaded.
-	 * @return boolean
-	 */
-	public static function autoload_class( $class ) {
-		$prefix   = 'WooCommerce\\RestApi\\';
-		$base_dir = __DIR__ . '/';
-
-		// does the class use the namespace prefix?
-		$len = strlen( $prefix );
-
-		if ( strncmp( $prefix, $class, $len ) !== 0 ) {
-			return self::autoload_from_classmap( $class );
-		}
-
-		$relative_class = substr( $class, $len );
-		$file           = $base_dir . str_replace( '\\', '/', $relative_class ) . '.php';
-
-		if ( file_exists( $file ) ) {
-			return include $file;
-		}
-	}
-
-	/**
-	 * Try to autoload a class from a classmap.
-	 *
-	 * @param string $class Class being autoloaded.
-	 * @return boolean
-	 */
-	protected static function autoload_from_classmap( $class ) {
-		if ( empty( self::$classmap ) ) {
-			return false;
-		}
-
-		if ( array_key_exists( $class, self::$classmap ) ) {
-			return include self::$classmap[ $class ];
-		}
-	}
-}