restrict woocommerce ordering until member is registered and accepted

I have a store that sells wholesale doctor's products. Because of licensing restrictions I cannot allow orders until we have approved the new member via a license check which can take a couple of days. I guess that really doesn't matter except to explian the process that we have to go through before accepting an order. So... how can I prevent people from placing an order before they are an approved site member?
Thanks in advance!