The error "Payment Center Settings has not been setup, please go to Payment Center Settings Tab and click the button to add Settings."  typically occurs when the user lacks proper access to Payment Center components. This is commonly faced by new users in the organization.

To address this error, it is recommended to contact your System Administrator to verify if you have the necessary license and permissions to access Payment Center objects and components. 

For detailed instructions, please click on the link provided below:

To assign a permission set:

• Permission Set Assignment

• Payment Center Permission Sets

To assign a license:

• Assigning licenses