Deferred Invoicing

I am looking to deploy this application for a Petrol station. They have a billing system where credit customers are billed twice a month. All transactions leading upto to the middle of the mont or end of the month are processed and statement are sent out.

The bills do not need to be posted on the day they are being billed, rather on the day that falls as the middle or end of each month.

Does Akaunting provide any kind of deferred invoicing feature as outlined above? Or is it better to maintain all bills seperately and then batch process via API? Safe to assume that batch invoice processing via API is possible?

Thanks