GPT Plus – AI Subscription Top-up is a third-party service designed to assist users, particularly those without overseas bank cards, in purchasing and renewing ChatGPT Plus and Pro subscriptions. The service is operated by Hong Kong AIGC Limited and is not affiliated with OpenAI. It provides an alternative payment method via Alipay, allowing Chinese users to complete transactions without requiring an international credit card. The website clearly states that specific delivery terms and guarantees are based on the order page, and the service acts as an independent intermediary. The platform offers multiple subscription tiers, including a standard Plus plan, a Pro plan with usage roughly equivalent to 10 times that of Plus (originally advertised as 5x, later updated), and a Pro plan with 20x capacity. Pricing is publicly displayed, with no hidden fees. The ordering process is straightforward: users select a plan, choose whether to request an invoice (with strict rules regarding later changes), and follow step-by-step instructions to submit their order. The system does not require users to provide their account passwords; instead, users submit official session information to facilitate the top-up. After payment, order tracking and customer support channels are available to address any issues. Typical use cases involve users who have a ChatGPT account but lack the means to pay for a subscription due to geographic or banking restrictions. The workflow begins with selecting a desired plan on the website, completing payment through Alipay, and then providing the necessary session details as instructed. A video tutorial is available to guide users through the process and explain common pitfalls based on real business experience. The service also publishes updates and policy changes from OpenAI to inform users about adjustments to subscription features, such as the recent doubling of Pro usage limits.