Logon to admin.aktiv.com (Admin Site).
Search for Create LTI Source, to find the widget named Create LTI Source (Matching Willo Labs Configuration + Integration).
Sakai Institution LTI Source (sakai.institution.com).Consumer Key and Consumer Secret as is.Launch Key that you got from the corresponding Willo Integration. This is the 6 digit code and the end of the Launch URL:

CREATE LTI SOURCE.Associate this LTI Source with an institution from Admin Site Institution.