Options:

- client.name.full
- client.name.short
- client.contact.email
- client.contact.email.user-notifications   (optional) true|false
- client.contact.phone
- client.website                            URL
- client.website.contact                    URL
- client.website.imprint                    URL
- client.website.privacy                    URL

- service.name.full
- service.name.short
- service.user.registration                 true|false
- service.user.registration.message         (optional)
- service.user.registration.terms.file      (optional)
- service.user.registration.terms.name      (optional)
- service.user.registration.privacy.file    (optional)
- service.user.registration.privacy.name    (optional)
- service.user.activation                   immediate|manual|manual-email|email
- service.calendar.days                     int
- service.calendar.day-exceptions           (optional)
- service.website                           URL
- service.meta.description                  (optional)
- service.maintenance                       (optional) true|false
- service.maintenance.message               (optional)
- service.branding                          (optional) true|false
- service.branding.name                     (optional)
- service.branding.website                  (optional)
- service.pricing.visibility                public|private|never
- service.pricing.payment                   none|invoice|paypal|invoice,paypal
- service.status-values.billing             (optional)

- subject.help                              HTML
- subject.about                             HTML
- subject.type                              (including determiner)
- subject.square.type
- subject.square.type.plural
- subject.square.unit
- subject.square.unit.plural



Booking meta keys:

- date_start                                (for subscriptions)
- date_end                                  (for subscriptions)
- time_start                                (for subscriptions)
- time_end                                  (for subscriptions)
- repeat                                    (for subscriptions)
- notes                                     (optional)
- creator                                   (optional, if created by admin or assist)
- cancellor                                 (optional, if cancelled by admin or assist)
- cancelled                                 (optional, if cancelled by admin or assist)
- player-names                              (optional, if multi-player bookinh)



Reservation meta keys:

- notes                                     (optional)



Event meta keys:

- name
- description                               HTML
- notes                                     (optional)



Square meta keys:

- info.pre                                  (optional)
- info.post                                 (optional)
- info.capacity                             (optional) true|false
- rules.text                                (optional)
- rules.document.file                       (optional)
- rules.document.name                       (optional)
- readonly.message                          (optional)
- public_names                              (optional) true|false
- private_names                             (optional) true|false
- capacity-ask-names                        (optional)
- label.free                                (optional)
- pseudo-time-block-bookable                (optional) true|false



User meta keys:

- gender
- firstname
- lastname
- street
- zip
- city
- phone
- birthdate                                 (optional)
- locale                                    (optional)
- allow.{privilege}                         (optional) true|false
- notification.bookings                     (optional) true|false
- deletion.reason                           (optional)
- legacy-pw                                 (optional)
- notes                                     (optional)
