Deactivate your Zalando account in the assistant. Just as you activate it, you can deactivate it (Here we explain where you can find this step).

Save the settings of the assistant and then delete it.

Additionally, the Zalando user you created specifically for Zalando can be removed or the API rights can be revoked. However, this step is not strictly necessary, as no data transfer to Zalando takes place without an active account.