I faced the following sentence when I tested my product:
“You exceeded your current quota, please check your plan and billing”
Please help me to clarify if I must pay the bill for Thunkable or ChatGPT?
Hey there, @nguyenductrinhan81rs and welcome to Thunkable! 
Can you please provide some images so that we can have some more clarity on your problem? Also this would be addressed as “Questions about Thunkable,” not “Free Templates, Designs, and Block Combinations”
@nguyenductrinhan81rs This is for the Open AI API credits that are required for queries. They are no longer offer any free credits to new accounts.
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As @matt_conroy has said, this is the ChatGPT Tokens. You will have to purchase some more or your users will not be able to use it.