Hi @nournabil725
Udemy gives a 30 days money back guarantee on every course purchase ; therefore, the revenue you get from a sale, is only paid to you AFTER this 30 day refund window has passed since the date of purchase. Also note that, Udemy pays your monthly revenue on the fixed 7th/8th day of every month.
You can also check your monthly revenue report here which specifically tells you the payout date for each month.
Hope this helps!
