How to Handle Payment Requests in a Construction App When Full Payment is Given Mid-Month?"

Hi all, i am working on a construction app, where there are 2 roles, subcontractor and supervisor, subcontractor creates the project, work, worker and supervisor, and assign the workers and supervisors to project. now supervisors job is to assign attendance, add work log and request payment on behalf of workers, now there is no restriction on when supervisor can request payments, they can do at the end of the month and at mid month (payment is based on the attendance marked by supervisor), now when i request the payment and it is approved(by subcontractor), i store it in the database with the month, so to avoid the supervisor to request again for the same month, now my problem is, let say supervisor request payment in the mid month and it gets approved, now again supervisor request payment at the end of the same month, but the request won't be process because payment is already made for the month So what is the best way to go about this? Thanks in advance.