Last reviewed: 04.11.2026
Set your Callback URL and copy the Sign Key in the Dashboard. Your server must reply with HTTP 200. If it does not, we retry with growing intervals. You can see the callback history and resend a callback on the Widget Callbacks page of the Dashboard.
Is the fee included in fiat_amount?
Yes, fiat_amount includes the fee. The crypto amount in the withdraw transaction is lower than in the buy transaction by the network fee.
Where do I find the blockchain transaction hash?
In tx.id of the withdraw callback with status completed.
Do chargebacks and disputes come as callbacks?
No. We inform you about chargebacks and disputes through other channels, as set out in your agreement.
Details: https://widget.docs.mercuryo.io/guide/monitoring/callbacks