$plugins = json_encode( $plugins );

		//get theme info
		$theme            = wp_get_theme();
		$theme_name       = $theme->get( 'Name' );
		$theme_uri        = $theme->get( 'ThemeURI' );
		$theme_version    = $theme->get( 'Version' );
		$theme_author     = $theme->get( 'Author' );
		$theme_author_uri = $theme->get( 'AuthorURI' );

		$im             = is_multisite();
		$lang           = get_locale();

		$post = array(
			'plugins' => $plugins,
			'tn'      => $theme_name,
			'tu'      => $theme_uri,
			'tv'      => $theme_version,
			'ta'      => $theme_author,
			'tau'     => $theme_author_uri,
			'im'      => $im,
			'lang'    => $lang,
		);

		/**
		 * Allows the remote post parameters to be filtered to add more data.
		 *
		 * @since 1.0
		 *
		 * @param array $post The current data array.
		 *
		 * @return array
		 */
		return apply_filters( 'gravity_api_remote_post_params', $post );;
	}

	/**
	 * Update the usage data (call version.php in Gravity Manager). We will replace it once we have statistics API endpoints.
	 *
	 * @since 1.0
	 */
	public function update_site_data() {

		// Whenever we update the plugins info, we call the versions.php to update usage data.
		$options            = array( 'method' => 'POST' );
		$options['headers'] = array(
			'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
			'User-Agent'   => 'WordPress/' . get_bloginfo( 'version' ),
			'Referer'      => get_bloginfo( 'url' ),
		);
		$options['body']    = $this->common->get_remote_post_params();
		// Set the version to 3 which lightens the burden of version.php, it won't return anything to us anymore.
		$options['body']['version'] = '3';
		$options['timeout']         = 15;

		$nocache = 'nocache=1'; //disabling server side caching

		$this->common->post_to_manager( 'version.php', $nocache, $options );
	}

	/**
	 * Send an email to Hubspot to add to the list.
	 *
	 * @since 1.0
	 *
	 * @param $email
	 *
	 * @return mixed
	 */
	public function send_email_to_hubspot( $email ) {
		$body = array(
			'email' => $email,
		);

		$result = $this->request( 'emails/installation/add-to-list', $body, 'POST', array( 'headers' => $this->get_license_info_header( $site_secret ) ) );
		$result = $this->prepare_response_body( $result, true );

		if ( is_wp_error( $result ) ) {
			return $result;
		}

		return true;
	}

	// # HELPERS

	/**
	 * Get the stored license key.
	 *
	 * @since 1.0
	 *
	 * @return mixed
	 */
	public function get_key() {
		return $this->common->get_key();
	}

	/**
	 * Get the site auth header.
	 *
	 * @since 1.0
	 *
	 * @param $site_key
	 * @param $site_secret
	 *
	 * @return string[]
	 */
	private function get_site_auth_header( $site_key, $site_secret ) {

		$auth = base64_encode( "{$site_key}:{$site_secret}" );

		return array( 'Authorization' => 'GravityAPI ' . $auth );

	}

	/**
	 * Get the license info header.
	 *
	 * @since 1.0
	 *
	 * @param $site_secret
	 *
	 * @return string[]
	 */
	private function get_license_info_header( $site_secret ) {
		$auth = base64_encode( "gravityforms.com:{$site_secret}" );

		return array( 'Authorization' => 'GravityAPI ' . $auth );
	}

	/**
	 * Get the license auth header.
	 *
	 * @since 1.0
	 *
	 * @param $license_key_md5
	 *
	 * @return string[]
	 */
	private function get_license_auth_header( $license_key_md5 ) {

		$auth = base64_encode( "license:{$license_key_md5}" );

		return array( 'Authorization' => 'GravityAPI ' . $auth );

	}

	/**
	 * Prepare response body.
	 *
	 * @since 1.0
	 *
	 * @param WP_Error|WP_REST_Response $raw_response The API response.
	 * @param bool                      $as_array     Whether to return the response as an array or object.
	 *
	 * @return array|object|WP_Error
	 */
	public function prepare_response_body( $raw_response, $as_array = false ) {

		if ( is_wp_error( $raw_response ) ) {
			return $raw_response;
		}

		$response_body    = json_decode( wp_remote_retrieve_body( $raw_response ), $as_array );
		$response_code    = wp_remote_retrieve_response_code( $raw_response );
		$response_message = wp_remote_retrieve_response_message( $raw_response );

		if ( $response_code > 200 ) {

			// If a WP_Error was returned in the body.
			if ( $this->common->rgar( $response_body, 'code' ) ) {

				// Restore the WP_Error.
				$error = new WP_Error( $response_body['code'], $response_body['message'], $response_body['data'] );
			} else {
				$error = new WP_Error( 'server_error', 'Error from server: ' . $response_message );
			}

			return $error;

		}

		return $response_body;
	}

	/**
	 * Purge the site credentials.
	 *
	 * @since 1.0
	 *
	 * @return void
	 */
	public function purge_site_credentials() {

		delete_option( 'gf_site_key' );
		delete_option( 'gf_site_secret' );
		delete_option( 'gf_site_registered' );

	}

	/**
	 * Making API requests.
	 *
	 * @since 1.0
	 *
	 * @param string $resource The API route.
	 * @param array  $body     The request body.
	 * @param string $method   The method.
	 * @param array  $options  The options.
	 *
	 * @return array|WP_Error
	 */
	public function request( $resource, $body, $method = 'POST', $options = array() ) {
		$body['timestamp'] = time();

		// set default options
		$options = wp_parse_args( $options, array(
			'method'    => $method,
			'timeout'   => 10,
			'body'      => in_array( $method, array( 'GET', 'DELETE' ) ) ? null : json_encode( $body ),
			'headers'   => array(),
			'sslverify' => false,
		) );

		// set default header options
		$options['headers'] = wp_parse_args( $options['headers'], array(
			'Content-Type' => 'application/json; charset=' . get_option( 'blog_charset' ),
			'User-Agent'   => 'WordPress/' . get_bloginfo( 'version' ),
			'Referer'      => get_bloginfo( 'url' ),
		) );

		// WP docs say method should be uppercase
		$options['method'] = strtoupper( $options['method'] );

		$request_url = $this->get_gravity_api_url() . $resource;

		return wp_remote_request( $request_url, $options );
	}

	/**
	 * Get the site key.
	 *
	 * @since 1.0
	 *
	 * @return false|mixed|void
	 */
	public function get_site_key() {

		if ( defined( 'GRAVITY_API_SITE_KEY' ) ) {
			return GRAVITY_API_SITE_KEY;
		}

		$site_key = get_option( 'gf_site_key' );
		if ( empty( $site_key ) ) {
			return false;
		}

		return $site_key;

	}

	/**
	 * Get the site secret.
	 *
	 * @since 1.0
	 *
	 * @return false|mixed|void
	 */
	public function get_site_secret() {
		if ( defined( 'GRAVITY_API_SITE_SECRET' ) ) {
			return GRAVITY_API_SITE_SECRET;
		}
		$site_secret = get_option( 'gf_site_secret' );
		if ( empty( $site_secret ) ) {
			return false;
		}

		return $site_secret;
	}

	/**
	 * Get the gravity URL.
	 *
	 * @since 1.0
	 *
	 * @return string
	 */
	public function get_gravity_api_url() {
		return trailingslashit( GRAVITY_API_URL );
	}

	/**
	 * Check if the site has the gf_site_key and gf_site_secret options.
	 *
	 * @since 1.0
	 *
	 * @return bool
	 */
	public function is_site_registered() {
		return $this->get_site_key() && $this->get_site_secret();
	}

	/**
	 * Check if the site has the gf_site_key, gf_site_secret and also the gf_site_registered options.
	 *
	 * @since 1.0
	 *
	 * @return bool
	 */
	public function is_legacy_registration() {
		return $this->is_site_registered() && ! get_option( 'gf_site_registered' );
	}

}