pay-as-you-go

/P EY1 AE0 Z Y UW0 G OW0/
noun
  1. 1

    A financial policy by which capital projects are financed from current revenue in the operating budget rather than through borrowing.

  2. 2

    A payment method where credit is purchased in advance, used in small amounts and topped up when required. Used especially of mobile phones and transport ticketing.

Source: https://en.wiktionary.org/wiki/pay-as-you-go