How to set default some option?

Hello,

In my app, a customer can add as many payment methods as (s)he wants.

Id’ like to let him choose one being set to default.

Linked to a field called “Default”, I put a checkbox in the Repeating Group showing all options. Of course, if the customer checks this box, the method will be marked as default. Now I need to uncheck every single other method.

Do I absolutely need to use API Workfllow on a list (which is quite not immediate) ? Isn’t it out there some other simpler way, like some radio buttons for example, allowing just one option to be set to YES in the linked field ?

Thank you,

Michel