Fundamentals
Clinical guide
Biomaterials
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Scanned on the store’s own page types. Every entry has a real purpose.
| Name | Purpose | Lifetime |
|---|---|---|
| cart_currency | Remembers which currency the cart calculates in | 14 days |
| _shopify_essential | Keeps checkout and payment working | 1 year |
| _shop_app_essential | Preserves the cart across Shop Pay | 1 year |
| _shopify_test | Checks whether the browser allows cookies at all | Session |
| signInWithShop:cartSync… | Syncs the cart with Shop Pay | Persistent |
| bss-login-session-id | Controls access to the locked B2B pages | Session |
| themeJsAutoReload | Reloads the page once if the theme fails | Session |
| Name | Purpose | Lifetime |
|---|---|---|
| localization | Remembers your language and time zone | 1 year |
| Concept:filters-toggle | Remembers whether product filters are open | Persistent |
| Concept:recently-viewed | Remembers the products you last viewed | Persistent |
| lyst-customerGuid | Ties your wishlist to this browser | Persistent |
| Name | Purpose | Lifetime |
|---|---|---|
| _shopify_y | Distinguishes returning from new visitors | 1 year |
| _shopify_s | Measures a single visit so we can count sessions | 1 day |
| shopify_client_id | Aggregates page views for store statistics | 1 year |
| _shopify_sa_t / _shopify_sa_p | Records which page and source a purchase came from | 30 minutes |
| _ga | Google Analytics: distinguishes visitors, via the Google & YouTube app | 13 months |
| _ga_MDYP6HWQZZ | Google Analytics: keeps your session state for Google Merchant Center | 13 months |
| Name | Purpose | Lifetime |
|---|---|---|
| __kla_id | Links your activity to your Klaviyo newsletter | 2 years |
| __kl_key | Identifies you to Klaviyo’s forms | Persistent |
| __kla_viewed | Remembers products you viewed, for the newsletter | Persistent |
| klaviyoOnsite | Tracks whether you already subscribed | Persistent |
| $referrer / $last_referrer | Remembers where you came from, for the newsletter | Persistent |
| _shopify_marketing | Measures which channel brought you here | 1 year |
Videos are replaced by a still image. YouTube is contacted only once you press play — and only then are these set.
| Name | Purpose | Lifetime |
|---|---|---|
| VISITOR_INFO1_LIVE | Estimates your bandwidth for the player | 180 days |
| YSC | Counts which videos you have watched | Session |
| __Secure-YEC / __Secure-YNID | Remembers your player preferences | 180 days |
| yt-player-… / ytidb-… | YouTube’s own player and log data | Persistent |
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