The right moment, not the next day
The request goes out when the customer has just been served and the satisfaction is still fresh: when the keys are handed back, at the end of the job, as they leave the appointment. After forty-eight hours, response rates collapse.
We plug the sending into the way you already work, not the other way round. Depending on the case: an export from your management software, a manual send at the end of the day, or a simple QR code on the counter.