Which payment service providers are supported?

At the moment following payment service provider, methods and integrations are supported by billwerk:

Payment Service Provider	Credit Card	SEPA-Direct Debit	On Account	PayPal	In-App Purchase	Prepaid cards	Integration	Checkout Page	Origin
Adyen	X	X					Classic integration for Ecommerce	Checkout Seamless	Netherlands
Amazon					X		IAP	In-App	USA
Apple					X		Store Kit for In-App Purchase	In-App	USA
PAYONE	X	X	X				Standard	Checkout Seamless	Germany
Epay						X	Standard API	Custom	Germany
GoCardless		X					Redirect Flow Full Version API	GoCardless Checkout Page (Redirect Flow) Checkout Seamless (Full Version API)	United Kingdom
Google					X		IAP	In-App	USA
Unzer (Heidelpay)	X	X					Single Channel	Heidelpay Checkout Page Checkout Seamless	Germany
PayPal				X			Adaptive Payments Reference Transactions	PayPal Checkout	USA
Paymill	X	X					Standard	Checkout Seamless	Germany
SlimPay	X (only for SlimPay Enterprise)	X					SlimPay One SlimPay Enterprise	SlimPay Checkout Page (Enterprise) Checkout Seamless (One)	France
Stripe	X	X					Standard	Checkout Seamless	USA
Wirecard	X	X					Standard API Elastic Engine	Wirecard Checkout Page Checkout Seamless	Germany
Wordline	X						Office API	Worldine Checkout Page Checkout Seamless	France
Worldpay	X	X					Hosted integration	Checkout Seamless	USA