Go to: https://platform.openai.com/
Then Choose: the settings gear in the top right.
Then select: Billing (under Organization)
From there you can: Add to credit balance
OR
You will likely need to go to: Set Usage Limits. Scroll down to the Usage Limits section. From there you can change your Budget Limit (which may currently be too low).
Fixing Open AI API Key Issues in Clay: Guidance Needed | Clay