Trustly - Trustly is an online banking payments solution that enables your payments to pass from one account to the next and so forth without the need for registration, cards, or app downloads.
Muzli - UI/UX and Design Inspiration Chrome Extension
G2A PAY - G2A PAY is one of the prominent Online Payment Gateway that enables you to pay and receive e-payments globally.
UI Garage - Specific mobile and web design patterns for your inspiration
Alipay - Alipay.com is a third-party online payment platform with no transaction fees.
Design Hunt - Curated design inspiration for everyone