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Cookies and local storage

The Sender.net JavaScript SDK stores a small amount of data on your visitors’ devices so that forms, popups and campaign attribution work correctly. All cookies are first-party: they’re set on your own domain with the path /.

Use this list to describe Sender.net in your cookie policy and to set up your consent banner.


CookiePurposeDurationSuggested category
sender_subscriber_idIdentifies the contact, so visits, carts and orders are credited to them and their campaign. Set when the visitor clicks a Sender.net campaign link, submits a form or is identified by the SDK.30 daysMarketing
sender_popup_shown_{form ID}Records when a popup was last shown, to respect its display frequency.30 daysFunctional
sender_subscribed_{form ID}Stops a popup from showing again after the visitor subscribed through it.30 daysFunctional
sender_countryStores the visitor’s country, to preselect the country code in phone fields and show date pickers in the visitor’s language. Set when a form with a phone or date field loads.30 daysFunctional

{form ID} is replaced with the ID of each popup.


KeyPurposeDurationSuggested category
sender_ecommerce_paramsStores the contact ID, campaign ID and campaign type, so visits, carts and orders are credited to the right campaign. Set at the same times as sender_subscriber_id.No expiry; removed when an order is completedMarketing

Depending on your forms and platform, the SDK may also use these services:

  • Google reCAPTCHA: if a form has reCAPTCHA turned on, the SDK loads Google’s reCAPTCHA script, which may set its own cookies. See Google’s privacy policy.
  • Cloudflare: to look up the visitor’s country for phone number and date fields, the SDK sends a request to Cloudflare. Cloudflare doesn’t set a cookie; the result is saved in the sender_country cookie.
  • npmcdn.com: for date fields, the date picker’s translation for the visitor’s country is loaded from npmcdn.com. No cookie is set.
  • Shopify: on Shopify stores, campaign parameters from Sender.net campaign links are saved to the visitor’s Shopify cart, unless attribution is disabled.

The suggested categories are a starting point. Check them against your own cookie policy and local laws.