It is possible to download a proof of transfer directly from your Qonto interface.
For example, in case of request for a proof by a third party.
Go to your webapp (desktop only), in the "History" section. Find the transfer for which you want a proof of transfer and click on it (you only can download the proof if the transfer is completed).
In the side panel, click on "Download Proof of Payment" to download the document. (see below)