Thank you for your response but this is not quite right, and I apologize because it was not very clear.
We have an annual subscription for 90 €
We want to offer this subscription for a period of 1 year: a payment of € 90, or a payment of 3 x € 30 (€ 30 the first month, second month € 30, € 30 and the third month)
(in fact, propose a payment three times)
Thank you for your help
cordially