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Editing: woocommerce-services.php

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<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class WC_Services_Installer {

/**
	 * @var Jetpack
	 **/
	private $jetpack;

/**
	 * @var WC_Services_Installer
	 **/
	private static $instance = null;

static function init() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new WC_Services_Installer();
		}
		return self::$instance;
	}

public function __construct() {
		$this->jetpack = Jetpack::init();

add_action( 'admin_init', array( $this, 'add_error_notice' ) );
		add_action( 'admin_init', array( $this, 'try_install' ) );
	}

/**
	 * Verify the intent to install WooCommerce Services, and kick off installation.
	 */
	public function try_install() {
		if ( ! isset( $_GET['wc-services-action'] ) ) {
			return;
		}
		check_admin_referer( 'wc-services-install' );

$result = false;

switch ( $_GET['wc-services-action'] ) {
			case 'install':
				if ( current_user_can( 'install_plugins' ) ) {
					$this->jetpack->stat( 'jitm', 'wooservices-install-' . JETPACK__VERSION );
					$result = $this->install();
					if ( $result ) {
						$result = $this->activate();
					}
				}
				break;

case 'activate':
				if ( current_user_can( 'activate_plugins' ) ) {
					$this->jetpack->stat( 'jitm', 'wooservices-activate-' . JETPACK__VERSION );
					$result = $this->activate();
				}
				break;
		}

$redirect = wp_get_referer();

if ( $result ) {
			$this->jetpack->stat( 'jitm', 'wooservices-activated-' . JETPACK__VERSION );
		} else {
			$redirect = add_query_arg( 'wc-services-install-error', true, $redirect );
		}

wp_safe_redirect( $redirect );

exit;
	}

/**
	 * Set up installation error admin notice.
	 */
	public function add_error_notice() {
		if ( ! empty( $_GET['wc-services-install-error'] ) ) {
			add_action( 'admin_notices', array( $this, 'error_notice' ) );
		}
	}

/**
	 * Notify the user that the installation of WooCommerce Services failed.
	 */
	public function error_notice() {
		?>
		<div class="notice notice-error is-dismissible">
			<p><?php _e( 'There was an error installing WooCommerce Services.', 'jetpack' ); ?></p>
		</div>
		<?php
	}

/**
	 * Download and install the WooCommerce Services plugin.
	 *
	 * @return bool result of installation
	 */
	private function install() {
		include_once( ABSPATH . '/wp-admin/includes/admin.php' );
		include_once( ABSPATH . '/wp-admin/includes/plugin-install.php' );
		include_once( ABSPATH . '/wp-admin/includes/plugin.php' );
		include_once( ABSPATH . '/wp-admin/includes/class-wp-upgrader.php' );
		include_once( ABSPATH . '/wp-admin/includes/class-plugin-upgrader.php' );

$api = plugins_api( 'plugin_information', array( 'slug' => 'woocommerce-services' ) );

if ( is_wp_error( $api ) ) {
			return false;
		}

$upgrader = new Plugin_Upgrader( new Automatic_Upgrader_Skin() );
		$result   = $upgrader->install( $api->download_link );

return true === $result;
	}

/**
	 * Activate the WooCommerce Services plugin.
	 *
	 * @return bool result of activation
	 */
	private function activate() {
		$result = activate_plugin( 'woocommerce-services/woocommerce-services.php' );

// activate_plugin() returns null on success
		return is_null( $result );
	}
}

WC_Services_Installer::init();

Editing: woocommerce-services.php

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