Improve reservation process, Drupal 9 webform with stripe or mollie

Drupal 9 webform with stripe or mollie
goal:
new module or updated current modules
cleaner/ faster less queries where possible
ls_booqable_api, available
ls_booqable_coiffeuse, working version basic workings
ls_booqable_therapy, needs the most work
Fine tuning of reservation proces
in case of failed payment
in case of no free slot
in case of other error
Improve payment integration Stripe or mollie
create or update customer info (already present error updating phone nr)
update reservation information(already present)

No placeholder bids, if you need more info→ ask everything is read.
Timing, not pressing.

Project site: https://www.chatogand.be/
external program: https://booqable.com/home/
api site: https://developers.booqable.com/

the page
https://www.chatogand.be/kattenhotel/reserveer