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Polar uses date-based API versions to evolve the API without unexpectedly changing the contract your integration depends on. Versions use the YYYY-MM format, such as 2026-10, and apply to API requests, responses, webhook payloads, and SDK types. Read more
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This will become the Current version on October 1st.
  • Removed the secret parameter when creating or updating webhook endpoints. New endpoint secrets are generated by Polar.
  • Added member_id and member to license key responses, identifying the seat member holding the key. Both are null for keys granted directly to a customer.
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Standard Webhooks signing

New webhook endpoints with secrets generated by Polar on or after September 8, 2026 at 00:00 UTC use signing compliant with the Standard Webhooks specification.Endpoints with secrets generated before this cutoff continue to use Polar’s previous signing approach, preserving compatibility with existing integrations. Endpoints with user-provided secrets also retain the previous approach. We will continue to support this approach for as long as necessary; there is no required migration deadline.To adopt Standard Webhooks signing for an existing endpoint, regenerate its secret and update your webhook handler to use the new secret. When using a Standard Webhooks library directly, pass the new secret as-is, without Base64-encoding it first.See webhook signature validation for details on both signing approaches.