CPA marketing programs pay affiliates when a specific action is taken by the referral or lead. Common actions include clicks, impressions, form submits, sign-ups, registrations, or opt-ins. Since Cost-Per-Action models don’t necessarily involve a direct sale (and involve more risk taking) the payout percentages are far smaller than they are in Cost-Per-Sale.
Using influencers to market your products or services is a great way to quickly saturate yourself into the marketplace, no matter what you're peddling. However, finding the right influencer at the right price is the hard part. You don't necessarily have to go to the top-tier influencers; you can also opt for micro-influencers (those that have 10,000 to 100,000 followers or fans).