Customer ID creation - repost

READ BEFORE BIDDING. WRITE IN YOUR BID RESPONSE THAT YOU KNOW HOW TO DO THIS PROJECT. OTHERWISE YOUR BID WILL BE DELETED IMMEDIATELY. When a new customer registers we want they should het a 6 digit ID. That Id should be internally recognized and globaly visual. Including front end, back end and invoices. This attribute should show up at any point a customer chooses to register. In the beginning ot checkout or thru the backend.