Sorry my English is not so good, hope you can get what I meaning.
In my scenario, all of my clients have limited session for their lesson, my clients pay me by cash and I wouldn't let they pay online.
The problem I facing is, after selected the services, wix booking shows me the times lot, I want to disable that button by checking the residual session of the user. Because that's strange that showing the available payment plan after press the book button if the user has no available session left.
Hope you can understand what I meaning. Thank you