Steam

ISteamCheckout

ISteamCheckout is the partner-only interface used to initiate, authorize, and finalize in-game microtransaction purchases through Steam Checkout.

GitHub

Other Resources

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API Reference
https://partner.steamgames.com/doc/webapi/ISteamCheckout

API entry from apis.yml

apis.yml Raw ↑ 
aid: steam:steam-checkout-api
name: ISteamCheckout
tags:
- Checkout
- In-Game Purchases
- Microtransactions
properties:
- url: https://partner.steamgames.com/doc/webapi/ISteamCheckout
  type: API Reference
description: ISteamCheckout is the partner-only interface used to initiate, authorize, and finalize in-game
  microtransaction purchases through Steam Checkout.