To automatically add a new reference to all applications created from a portal, follow the following steps:
Identify the origin of the application reference
Let's say you have an online rental site and each rental listing has a reference number. You can send the reference of each listing on your website to Clust.
Here's what you need to follow to dynamically add the reference to the url of your portal. 

Your Clust portal url will need to look like this: urlportail.com?ref=XXXXX

So the code to add is ?ref=YOURREFERENCE

If each upcoming application on the portal is created with this url, the reference will automatically be added to the application within Clust.

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