how to capture candidate source for different internal career site ORC

Summary:

we have 2 differrent internal career site ( not deployed on oracle) we would like to capture the candidate source for internal career site 1 and internal career site 2

Content (required):

We use currently an internal career site ( not oracle standard site) https://mobiliteinterne.natixis.com/fr

we will add a new internal career site managed in a new HRIS tool of the provider NEOBRAIN, where the internal candidate connect and apply to Job requisition

for the 1 st career site, the candidate source = internal career site

for the new career site, how can we track candidate source ?

Version (include the version you are using, if applicable):