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I originally just wanted to streamline my monthly ChatGPT subscription process, avoiding the need to contact someone each time and wait for them to perform the operation. Later, through researching payment methods, obtaining cards, and integrating automatic subscriptions, I built a card management system together with AI. The longer I use AI, the more I feel that the projects, materials, and long-term discussions accumulated in my account will become important personal data assets. This seemingly small subscription issue is also worth solving seriously. I thought the process would be simple, but during actual construction, I encountered many basic errors that repeatedly consumed quotas, and deployments got stuck again and again. Even when I thought it was almost finished and friends were waiting to use it, I decided to tear it down and rebuild. This article is my case study on&ld…