APIs to call after Payment Term Update in an Invoice

Hi,

I have to update Payment Terms in Open Invoices for selective suppliers. As there is no standard program to do this, I am planning to do a back end update. If I do so, what are the APIs I need to call to make sure the payment schedules are calculated correctly? Also, is there any other step I am missing other than calling API? Is there a potential problem in updating Payment Terms in Invoices via Back end?

Thanks.