Cannot set batch id when creating invoice payment

[Russell-Pollari]

When creating an invoice payment, an existing batch cannot be set. It always defaults to creating a new batch.

Though the docs mention that you can provide a batchId, it is not apparent how (or if) you should add this to the body

e.g. adding batchId does not work

    body = {
        "batchId": batch_id,
        "invoiceId": invoice.id,
        "amount": {
            "value": "10.00"
            "currency":  "CAD"
        },
    }

    trolley_client =  Configuration.gateway(public_key, private_key)
    invoice_payment = trolley_client.invoice_payment.create(body)
    # creates new batch