I have an appt for AZ on 7th July
The local hospital set an initial 5 days aside for foreigners in Hua Hin and went into the two Malls here to conduct registrations. No apps used. Good old paper forms and data being entered directly onto their system. You collected the appt card later the same day - 1 part computerised, the other hand written in English.
Sadly they didn't get all the vaccines they believed they were getting, so after tomorrow, they started today for Thai's, they will have run out, so all other appointments are cancelled. However, they will update information on their facebook page and no new registrations needed. We will get a message, something like, 'if your appointment was for 7th July, please now attend on x date at the same time'.