Custom validation code for if the Total field has $0 value on a multi-page form


I am in need of a gravity forms custom validation hook for the Total field, if the value is $0, meaning the user has not selected a product from the form, which also happens to be a multi-page form. Each page has a total at the bottom of page that accumulates as the user adds products from each page to the form.

I would prefer to have validation on the last page, before user submits the form - or if this is not possible, a custom notification that can be sent to the user after form submission when this specific condition ($0 value) exists.

I have been through many forums and tried many suggested solutions, but so far nothing I’ve tried has worked.

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