Cashing in to your GCash account from Australia can be done via several methods. You can use online remittance services like PayPal or Western Union, which allow you to fund your GCash account directly. Additionally, some local banks offer international remittance services that can be linked to your GCash. Be sure to check the fees and processing times for each method, and always refer to the official GCash website for the most current information on cash-in options.