company/attendances only start or end time possible?

Hi,

I need to use the api call to only send a start or end time of the employee.
The reason is that we are working with terminals where employees can log in by fingerprint. the stored data will be transfered over the personio api every hour, so in most cases, I have only the start time, not the end time. But I can't use the api call without end time or/and break time. Break time is only possible if I have the end time to calculate the automatic substracted break time.

Is there a quick solution for that?

Thanks