Solution: https://www.prestashop.com/forums/topic/364875-how-to-delete-cookies-customers/?tab=comments#comment-2348354
Overriding the method __construct (classes/Cookie.php) changing the commented lines
override/classes/Cookie.php
class Cookie extends CookieCore { public function __construct($name, $path = '', $expire = null, $shared_urls = null, $standalone = false, $secure = false) { $this->_content = array(); $this->_standalone = $standalone; $this->_expire = is_null($expire) ? time() + 1728000 : (int)$expire; $this->_path = trim(($this->_standalone ? '' : Context::getContext()->shop->physical_uri).$path, '/\\').'/'; if ($this->_path{0} != '/') { $this->_path = '/'.$this->_path; } $this->_path = rawurlencode($this->_path); $this->_path = str_replace('%2F', '/', $this->_path); $this->_path = str_replace('%7E', '~', $this->_path); $this->_domain = $this->getDomain($shared_urls); //remove www from url > example: .domain.com $this->_domain =str_replace('www','', $this->_domain); //Change cookie name "PrestaShop" > "MyCookieName" This will make all your customers cookies obsolete. $this->_name = 'MyCookieName-'.md5(($this->_standalone ? '' : _PS_VERSION_).$name.$this->_domain); $this->_allow_writing = true; $this->_salt = $this->_standalone ? str_pad('', 8, md5('ps'.__FILE__)) : _COOKIE_IV_; if ($this->_standalone) { $this->_cipherTool = new Blowfish(str_pad('', 56, md5('ps'.__FILE__)), str_pad('', 56, md5('iv'.__FILE__))); } elseif (!Configuration::get('PS_CIPHER_ALGORITHM') || !defined('_RIJNDAEL_KEY_')) { $this->_cipherTool = new Blowfish(_COOKIE_KEY_, _COOKIE_IV_); } else { $this->_cipherTool = new Rijndael(_RIJNDAEL_KEY_, _RIJNDAEL_IV_); } $this->_secure = (bool)$secure; $this->update(); } }