Takes care of charges ahead of time

• Advances money for
• Settles ahead of time
• Buys on layaway
• Sends a check with the order
• Finances in advance
• Locks something in before it comes out?
• Avoids a bill
• Settles the bill beforehand

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: prepay )