Set the meeting url using a flow
This is an example how to setup a very simple flow adding the Zoom link to the reservation once it’s created.
Go to Setup -> flows and create a new flow
Create a Scheduled path
Create a variable that can have multiple values of the reservation and fill it with the reservations you want to have a meeting created for using.
Add an Apex Action to the scheduled path
Select / Search for “Create Zoom meetings for list of reservations”
Set the input value “reservations“ to your reservation list
Set the input value for “zoomUserId“ to the e-mail address of the zoom user you want to be the creator of the meeting
Save and activate the flow
The flow will now fill the “Zoom_Join_Url__c” field on the Reservation object asynchronously depending on your configuration.