A CPA offer defines a specific action an affiliate network will pay for — a completed lead form, a first deposit, a trial signup, an app install — and sets a fixed payout per completed action, regardless of the transaction's ultimate value. It's the most common payout structure in affiliate marketing because it's simple to track and clearly defines what both sides are being paid for.
Media buyers running traffic against CPA offers manage their own ad spend efficiency (CPA to Meta) against the offer's payout to determine margin — the offer only becomes profitable once the cost to acquire the action through ads is reliably below what the network pays for it.

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