If you add a venue to a collection that uses the API such as the Westminster collection if the client advises the venues isn't visible to them you must complete these check before escalating to a developer in the Slack API channel.
Adding Venues to Collections in My Events Channel
When adding a venue to a collection we need to ensure the following for the venue is correct. All of these can be updated on the Admin Only tab.
The venue is published on MyEventsChannel
The venue is active and not retired
The venue is set as public and not private to any GRATIS Agents
You will also need to check that the venue has been added to the correct collection on the Availability & Collections tab
If all of these are correct and the venue is still not visible in the collection or through their API then please contact the developers for support.