AP/AR Netting: Is there an API to Create an AP/AR Netting Batch ?

There is NO public Api's to create an AP/AR Netting Batch.

There are however some Receipt APIs that you may find useful:

AR_RECEIPT_API_PUB.apply_open_receipt - Creates a receipt-to-receipt application (payment netting).
AR_RECEIPT_API_PUB.unapply_open_receipt - Unapplies a receipt-to-receipt application.