Buyer need to give me a Gmail and password that has a Gemini Pro trial
I’ll buy Gemini Pro on that account
To buy Gemini on your account, your Gmail accounts Gemini must look like the photos below.
Go to https://gemini.google.com/app

There should look like the image below
https://ibb.co/nqDjzLqv
Then click on 'Upgrade button' on the upper right

There should look like the image below
https://ibb.co/M52hQyqx 
If it looks like this, then I can buy Gemini Pro on your Gmail.