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Не выдумывал ничего нового, вся инструкция по системным ЧПУ от сюда собрана в модификатор чтобы Вам было удобней https://nataws.com/2018/02/22/chpu-v-opencart-dlya-sistemnyx-stranic/
Список изменяемых системных URL, если вам нужен другой ключ ЧПУ, просто переименуйте 2-й ключ в поле VALUES
INSERT INTO oc_url_alias (query, keyword) VALUES ('common/home', '');
INSERT INTO oc_url_alias (query, keyword) VALUES ('checkout/cart', 'shopping-cart');
INSERT INTO oc_url_alias (query, keyword) VALUES ('checkout/checkout', 'checkout');
INSERT INTO oc_url_alias (query, keyword) VALUES ('checkout/voucher', 'gift-vouchers');
INSERT INTO oc_url_alias (query, keyword) VALUES ('product/special', 'specials');
INSERT INTO oc_url_alias (query, keyword) VALUES ('product/manufacturer', 'brands');
INSERT INTO oc_url_alias (query, keyword) VALUES ('product/compare', 'compare-products');
INSERT INTO oc_url_aliass (query, keyword) VALUES ('product/search', 'search');
INSERT INTO oc_url_alias (query, keyword) VALUES ('information/contact', 'contact-us');
INSERT INTO oc_url_alias (query, keyword) VALUES ('information/sitemap', 'sitemap');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/wishlist', 'wishlist');
INSERT INTO oc_url_aliass (query, keyword) VALUES ('account/account', 'my-account');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/return/insert', 'request-return');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/login', 'login');
INSERT INTO oc_url_aliass (query, keyword) VALUES ('account/logout', 'logout');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/order', 'order-history');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/newsletter', 'newsletter');
INSERT INTO oc_url_aliass (query, keyword) VALUES ('account/forgotten', 'forgot-password');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/download', 'downloads');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/return', 'returns');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/transaction', 'transactions');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/register', 'create-account');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/edit', 'edit-account');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/password', 'change-password');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/address', 'address-book');
INSERT INTO oc_url_alias (query, keyword) VALUES ('account/reward', 'reward-points');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/account', 'affiliates');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/edit', 'edit-affiliate-account');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/password', 'change-affiliate-password');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/payment', 'affiliate-payment-options');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/tracking', 'affiliate-tracking-code');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/transaction', 'affiliate-transactions');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/logout', 'affiliate-logout');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/forgotten', 'affiliate-forgot-password');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/register', 'create-affiliate-account');
INSERT INTO oc_url_alias (query, keyword) VALUES ('affiliate/login', 'affiliate-login');
