I have a client that requires custom order, invoice and shipment number to be present in emails and while printing them out... The best possible modification would be to change the code that assigns those numbers.
How would I go about changing this so Magento generates these numbers the way i want them to?
Edit: I'm sory that I wasn't specific enough first time... i don't need a way to change the order increment or starting number but rather change the whole logic of assigning/generating those numbers.
Eg: I would like to have a order number that would be todays date (220114) with a postfix which would be something like the number of todays order (if its the third order today then that postfix wold be 3), invoice number would have additional postfix that would correspond to payment method used and shippment number would a postifx that would describe the shipping method used.
So what i really need is location of the magento code that is responsible for generating current/default numbers and switch that code with my own as needed.