Commission comes from one source: eligible purchases.
Priority Review is a paid option applicants can buy to put their application at the front of a recruiter's queue. When an applicant buys it on a job posted by an employer attributed to you, and that payment is processed (not pending, not failed, not refunded), 35% of the payment amount accrues to you.
What this means in practice: you are not selling a subscription to the employer. Employers post jobs on Offerrole for free. Your commission comes from applicant purchases on those postings — so the employers worth introducing are the ones who hire continuously and at volume, because more live postings mean more applicants and more purchases.
Three things do not earn commission: employer signups on their own (an account that never posts produces nothing), job postings on their own (a posting nobody applies to produces nothing), and payments that fail or are refunded.
The partner help centre covers attribution, the ledger, payouts and the selling rules.