Referrals - how to obtain the referrer’s source
OAuth 2.0 connection required to operate inside Customer API
Obtain the existing sources from the Smartrecruiters users’ account- you need to use the specific “id” generated by the system for each referral.
GET/configuration/sources -returns the list of existing sources for this customer’s account.
GET/configuration/sources/{sourceType}/values -returns the list of users, available under the requested source type
Find the desired referrer information in the response body

GET/configuration/sources/{sourceType}/values/{sourceValueId} -returns the user matching the requested criteria
Use the source information when pushing the candidate to Smartrecruiters so the candidate will be displayed with an appropriate source, indicating that they were referred by the user:
POST /postings/{uuid}/candidates
Now the user will know who the candidate was referred by