...
config:auth_scheme=header_token_ukgpro
config:auth_token=<a random 12 character password string that acts as a secure token>
Use this string when configuring webhook in UKG pro - specifically, step 5 of Add Subscription asks you to add a free form headers fields. Set the custom header key to x-onlink-key token and custom header value to the random password string. Note that this random password is encoded once you save the settings and cannot be retrieved back.
...
OnLink combines employee demographic data and employment data and makes it available for mapping. Any field supported by UKG Pro API can be mapped in this way. Your UKG Pro service account must have the "View" role for the "Personnel Integration" Web Service.
key:employeeId=customfield_1012110062
map:firstName=customfield_10063
map:lastName=customfield_10064
map:demographicData.companyId=customfield_10065
map:lastNamedemographicData.addressLine1=customfield_10066
map:jobData.jobTitle=customfield_10067
map:jobData.supervisorId=customfield_10068
map:jobData.originalHireDate=customfield_10069
...