What system is being changed?

M: Wendy, could you send a memo to all of our contract employees?
W: Absolutely. What’s it about?
M: Management has decided on a new payment system. From now on, I’d like everyone to send us an invoice for their work based on the same format. I’ll send you the invoice template to attach to the e-mail. This way, everyone’s pay statements will look the same.
W: That’s a great idea. I know there’s been some confusion with that. I’ll send a copy to the accounting department as well, just so they know that the memo’s been sent.