Paid ChatGPT in your own browser. Redeem the key and you get a Mix or Plus code. Install the EliteKeys extension (Chrome or Edge on PC, Lemur on Android, Orion on iPhone), open chatgpt.com, sign in with your EliteKeys username and password, and tap your code. The extension signs that browser into ChatGPT. A Plus code is ChatGPT Plus. A Mix code is a paid plan. Use the same browser profile after that. If that login dies, the extension swaps in another working account for the same code.