Cookie Policy
Last updated: 1 November 2026
This Cookie Policy explains what cookies and similar technologies we use on charlesmackaybooks.com, why we use them, and how you can control them. It supplements our Privacy Policy.
1. What are cookies?
Cookies are small text files placed on your device by a website. They are widely used to make websites work, or work more efficiently, and to provide information to the site owner. Similar technologies include local storage and session storage.
2. The cookies we use
Strictly necessary (always on)
These are required for the site to function. They are exempt from consent under regulation 6(4) of the Privacy and Electronic Communications Regulations 2003 (PECR).
| Name | Provider | Purpose | Lifetime |
|---|---|---|---|
| sb-*-auth-token | Supabase | Authentication session for logged-in customers. | Session / up to 1 year |
| cookie_consent | This site (first-party cookie) | Stores your cookie preferences so we do not ask again. | 1 year |
| cmb_order_token | This site (first-party cookie) | Opens your order status page from the link in your order email, without the code staying in the web address. Set only on that order's page. | 30 days |
| cmb_checkout_proof_* | This site (first-party cookie) | Proves that this browser started your checkout, so the order confirmation page can show your order after payment. | 24 hours |
| cart / basket | This site (localStorage) | Remembers items in your basket between page loads. | Until cleared or order placed |
| charles_mackay_shipping_country | This site (localStorage) | Remembers the delivery country selected for postage estimates and checkout. | Until changed or site data is cleared |
| __stripe_mid, __stripe_sid | Stripe | Fraud prevention on the Stripe-hosted checkout. | Up to 1 year |
Analytics (separate consent required)
Set only if you accept analytics cookies. Used to understand aggregate visitor behaviour and improve the site.
| Name | Provider | Purpose | Lifetime |
|---|---|---|---|
| _ga | Google Analytics 4 | Distinguishes unique users. | 2 years |
| _ga_RJS2CCBSJP | Google Analytics 4 | Persists session state for our GA4 property. | 2 years |
| charles_mackay_ga4_purchases | This site (localStorage) | Prevents the same verified order from being counted more than once in consented analytics. It stores only the latest 20 transaction IDs. | Until site data is cleared; older IDs are displaced after 20 newer purchases |
Google Customer Reviews (separate consent required)
This is off unless you enable its own preference. Enabling it loads Google's rating badge, which shares your IP address and browser/device information with Google. After a verified purchase, Google also receives the order ID, email address, delivery country and estimated delivery date so it can offer an optional purchase survey. This choice is independent of Google Analytics and advertising. Withdrawing it reloads the page to remove any loaded badge or survey surface.
Marketing / advertising (consent required)
Off by default. May be set in future if/when we run paid advertising campaigns.
| Name | Provider | Purpose | Lifetime |
|---|---|---|---|
| _gcl_au | Google Ads | Conversion linker for Google Ads campaigns. | 3 months |
3. Managing your cookie preferences
You set your initial preferences using the banner shown on first visit. You can change them at any time:
- : re-opens our banner so you can update your choices.
- You can also clear cookies and site data through your browser settings (Chrome, Firefox, Safari, Edge all provide controls under Settings » Privacy).
- Google offers a Google Analytics opt-out browser add-on at tools.google.com/dlpage/gaoptout.
4. Changes
If we add or change cookies we will update this page and, where required, ask for fresh consent through the banner.