A payment aggregator's conversion value comes almost entirely from recognition — a shopper who already trusts PayPal converts faster with it on the page than they would entering fresh card details, even though the underlying transaction cost is often higher for the merchant.
Why the specific provider matters
PayPal holds consumer funds for future purchases, Google Checkout stores card information for faster repeat checkout, and Amazon Payments leans on its own marketplace trust at a higher fee. Each converts differently depending on which of those specific behaviors matches your buyer.
What actually drives the conversion decision
Regional brand recognition matters more here than feature comparison — an aggregator your specific customer base already trusts will outconvert one with better terms but no name recognition. Worth confirming fraud guarantees and dispute handling before leaning on it as a conversion lever, since a bad dispute experience erodes the same trust that made it convert well in the first place.