Sandbox API will not work due to isufficent credits

I have not purchased any credit as still firmly in development stage.
When I follow “Hello World” Example I get

Your render request could not be processed because it exceeds one or more plan limits. ‘0.09’ credits required, you have ‘0’ credits left. Please upgrade to increase your plan limits

I have tipple checked I am using the sandbox API and not production
What am I doing wrong / missed

Hi @michael2,

The Sandbox should render for free with a watermark.

Could you send an email to support@shotstack.io using the email associated with your account so I can get this fixed for you?

Alternatively, you can send a message to support from your dashboard.