prepay

US /ˌpriːˈpeɪ/
UK /ˌpriːˈpeɪ/
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to pay for something before you get it or use it:

:
Parents can pre-pay for their children's school lunches online.
1.

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A prepay system or product involves paying for something before you use it:

:
A prepay toll system that eliminates the need for cash at toll booths is a good option for motorists.
1.

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a cell phone that you must pay to use before you use it, or an arrangement in which this is done:

:
Instead of getting a pre-pay, you can put the kids on dad's post-paid price plan.