# FIAT APIs **Replacing Google Play/ App Store in-app purchase API to enable FIAT-to-Crypto Service** Rollin.Games provides easy-to-integrate in-app purchase APIs, enabling developers to provide FIAT-to-Crypto services in the game by simply modifying the existing Google Play or App Store in-app purchase APIs. Which players can easily complete purchasing in the way they are already familiar with. **Multiple FIAT gateways to lower the entry barriers** Rollin.Games also provides built-in FIAT gateways, a more convenient and safer way for players to buy cryptocurrencies. Now, Rollin.Games supports credit card, TWD bank wire and will soon provide more FIAT gateways to lower the entry barriers to the ground. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://rollin-games.gitbook.io/rollin.games/solutions/api-wallet/fiat-apis.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.