How do I integrate Paytrail, and why is it the standard in Finland?

Paytrail is Finland’s leading payment aggregator (owned by Nets / Nexi). A single Magento module bundles 25+ payment methods in one checkout flow:

• Every Finnish bank, Nordea, OP-Bank, Aktia, S-Pankki, Danske, Säästöpankki, Handelsbanken, Ålandsbanken, OmaSP, POP Pankki, Oma Säästöpankki (A2A direct bank transfers, ~50% of FI online payments).
• Card rails, Visa, Mastercard, American Express via Paytrail’s acquirer.
• Mobile wallets, MobilePay (Danske Bank), Apple Pay, Google Pay.
• BNPL, Klarna, Walley (formerly Collector), OP Lasku.
• Invoice, OP Lasku, Walley Faktura, Klarna Faktura.

Magento integration: install the official Paytrail Magento 2 module (free, Composer-installable), enter your merchant ID + secret key, enable methods per store view. We configure per-language (Suomi / Svenska / English) checkout labels, ALV-inclusive amounts, and Finvoice 3.0 invoice generation for B2B orders. Settlement to your Finnish bank account is T+1; fees ~1.4% + €0.35 for cards, lower for A2A.