Upgraded from Drupal 7 to Drupal 9.
Using Drupal's view (which is now in core) to build a list of activities for members to register.

We just completed upgraded our site from Drupal 6 using Ubercart to Drupal 8 commerce. The project involves custom migration of data from drupal 6, enhancing the reservation modules of corporate passes and facilities. It also include custom modules for the purchase of tickets (Kidzania and Sentosa passes), registrations for the annual OLive Run, Dinner & Dance,
- Drupal 9 is scheduled to be released in June 2020. However, upgrading from Drupal 8 will not be complex as the last version Drupal 8 will be the same as the first version of Drupal 9, the difference being all deprecated codes will be removed. Migration from Drupal 8 to Drupal 9 will be easier than all previous migration.
- Drupal 6 is no longer supported. i.e. there will be no further official release.

Check your CHANGELOG.txt
If you do not have admin access to your drupal site, you can quickly check the version via the CHANGELOG.txt, eg. domain.com/CHANGELOG.txt where domain.com is the url to your drupal site


Most payment gateway do not allow order id to be re-used. i.e. order ids cannot be duplicated when being submitted to payment gateway for processing. For our case, we were migrating from Drupal 6 to Drupal 8 for one of our clients and we decided to re-start our order ids from 40001, having already used up to over 30,000 in the old site.
alter table commerce_order auto_increment = 40001;
- Read more about Drupal Commerce Order ID
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MOE celebrated the 50th anniversary by giving away free tickets to the Gardens by the Bay to their pioneers and seniors. The website was built in Drupal 7, customising the webform module for the registration process.