With RCUR it is possible to create a payment link with an "Open amount". This means that you do not enter an amount when creating the link, but that the payer can enter this himself.
The minimum amount that the payer can enter is € 1. There is no limit on the side of RCUR, but there is a limit per payment method of Mollie. More information about limits per payment method can be found in the Mollie help center.