Amazon - Open Channel Page from Offer Page

Amazon - Open Channel Page from Offer Page.

// ==UserScript==
// @name         Amazon - Open Channel Page from Offer Page
// @description  Amazon - Open Channel Page from Offer Page.
// @version      0.1
// @author       to
// @namespace    https://github.com/to
// @license      MIT
//
// @grant        GM_registerMenuCommand
// @grant        GM_openInTab
//
// @match        https://www.amazon.co.jp/gp/video/offers/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=amazon.co.jp
// ==/UserScript==

GM_registerMenuCommand('Open', () => {
	let match = location.href.match(/benefitId=(.+?)(&|$)/);
    if(match)
        GM_openInTab('https://www.amazon.co.jp/gp/video/storefront/?contentType=subscription&contentId=' + match[1]);
});