Drupal 8.x

Hello,

I'm currently researching possible solutions for an appointment booking system.

There is an existing Google calendar to serve as a base for scheduling, but it's a free one, so it doesn't use Google's "appointment slots" that come with a paid version.

Is there an appointment booking solution in drupal that allows to somehow update Google calendar?

I have 4 custom content types, Customer, Package, Term and Licence. The customer has an entity reference to multiple Licences (to keep track of multiple licences, some of which may have expired). Each licence has a start and end date, a Package and a Term referenced on it. Each package has its own term entities on it, e.g.

Package 1: 1 Year Term - £200, 2 Year Term £350 etc.
Package 2: 1 Year Term - £300, 2 Year Term £550 etc.

Is it proper to place a namespace call in your drupal .install file? I have a module and was using some standard functions such as

function setup_content() {
  <do some functions to setup sample content>
  return;
}

The purpose was to install some content and do some other setup of the module. I used this function in multiple .install files and started getting an error that it was declared multiple times.

Hi,

I got this error message :

I get the following error, but I do not understand the reason: