When you link a typeform to an appyReward campaign a rule is created to notify appyReward when a new typeform submission comes in.
This notification sent over the web is called a Webhook. Once your campaign is over, this Webhook will no longer be used. So, appyReward removes this WebHoook automatically. Nevertheless, you can do it manually from your appyReward account.
Remove a WebHoook to unlink a Typeform
1) Go to your account
2) Select "Typeform"
3) Click "Unlink" from the typeform for which you want to remove its WebHoook