Step 1
Copy the «checkUrl / avisoUrl» value from the «Yandex.Kassa» extension’s settings section of your Magento 2 backend to the clipboard.
Step 2
Switch the callback / webhook URLs block to the edit mode in the Yandex.Kassa merchant interface.
Step 3
Paste the clipboard’s value to the «checkUrl» and «avisoUrl» fields, and then press the «Сохранить» button:
