How do I easily obtain the first open posting period through the SAPB1 Service Layer?

[FLSAP]

Hi there,

I am trying to easily obtain the first open posting period through the SAP B1 Service Layer.

How does one get the most recent open posting period?
I have found the following endpoints:
CompanyService_GetFinancePeriods
CompanyService_GetPeriod
CompanyService_GetFinancePeriod

But I am struggling to see how I can easily get the current / next open postingperiod?

Best regards