This is likely due to one of two things:
1. The 'test enabled' box is selected in your PayBright payment settings on your Shopify store
2. The API key and API token in the PayBright payment settings are incorrect
To check those two, follow this guide to show you where they would be:
https://developer.paybright.com/docs/shopify
If further assistance is required, please email your dedicated onboarding specialist or msonboarding@paybright.com.