If you are looking for "payment tokens" in the context of digital assets (like Bitcoin, Ethereum, or Toncoin) that are used to pay for goods and services:

You can use dedicated apps like PLN Mobile or MMBC to enter your meter ID and select a payment amount.

For secure payment processing or banking authorization, you do not "buy" these in a traditional store but rather "order" or "provision" them: Manage your SecurID® token in Online Banking - Westpac

You can buy widely traded tokens using Australian dollars (AUD) on platforms like Binance Australia or Revolut Australia .