How do i let my users feed in their api key into my Custom GPT

Hello, Am developing my custom GPT and i wanted to make this gpt be able to make api calls (authenticated) to my backend systems.

So i enable actions into my GPT point to my services.

When the ChatGPT plus users wanted to use my custom GPT, how do i let them to enter the API key to be able to make those action calls?

Have you tried using Oauth?

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Thank you Jacob for quick reply.

Sorry naive question, how is plugin related to Custom GPT Actions?

Will the users need to install my plugin first and authenticate and then only they can use the custom GPT?