4. Is there a ban on corporate donations to candidates?

Article 10, the resolution of the high independent instance of elections, 2022-17, 1 July 2022, the rules, procedures, and methods to financing electoral campaign: cash or in-kind financing for the campaign is considered private financing, coming from natural entities only from non-participants.
Each individual can finance each participant within a limit of thirty times the minimum guaranteed wage in non-agricultural sectors according to the 48-hour system.
Private financing coming from legal entities of all types is prohibited.

Article 19, decree-law of 2011-87, of the organization of political parties: aid, donations, and gifts issued by legal entities, whether private or public, except funding included in the state budget.

Article 75, organic-law 2014-16, 26th May, of the elections and referendum: the electoral campaign and the referendum campaign shall be financed solely with self-financing and private financing in accordance with what is regulated by this law.

Unofficial English translation.

There is a ban against donations from legal entities.