Anyone who has donated a thing to another without legal ground is entitled to reclaim it from the recipient as a performance which was not due.
Civil Code
2015 English source edition · Current applicability not established.
This is the 2015 English-language edition attributed in its front matter to the Ministry of Justice. Eri Atlas has not independently verified the translation, later changes, or whether the text is currently in force. Nine passages are incomplete in the available scan and are identified where they occur.
Article 1702
Undue Payment · Preserved transcription; page attribution imported from the source collection. Verify against the original.
If the performance which was not due was the payment of a sum of money, the claim is for the restitution of the same amount.
Anyone who without legal ground has made a performance of some other kind is entitled to claim from the recipient that the performance be reversed.
The person who made the undue payment may demand restitution of the increments of the thing, or the legal interest of the money, from the date of the payment, where the payee acted in bad faith.