Cardaq provides payment solutions and card issuing services within the financial sector. The company offers products for processing payments, including services for issuing and acquiring cards, as well as tools for fraud prevention, invoicing, and managing business spending. Cardaq serves financial institutions and banks. Cardaq was formerly known as Cospay. It was founded in 2011 and is based in London, United Kingdom.

Stripe provides a suite of application programming interface (API)s for online payment processing and commerce solutions. The company offers services such as payment acceptance, subscription management, invoicing, sales tax automation, revenue recognition, and financial data analysis. Stripe serves various sectors including ecommerce, software as a service (SaaS), marketplaces, and platforms. Stripe was formerly known as SlashDevSlashFinance. It was founded in 2010 and is based in South San Francisco, California.

Checkout.com operates as a financial technology company offering a payment platform for businesses. The main services include processing payments, sending payouts, and managing card programs through a cloud-based solution. The platform supports a range of payment methods, includes fraud detection, compliance, and risk management, and provides tools for payment management. Checkout.com was formerly known as Opus Payments. It was founded in 2009 and is based in London, United Kingdom.

PayU focuses on enabling local and cross-border payments as well as providing financial services. It offers a payment platform that facilitates online payment processing and payment gateway services. It primarily serves sectors such as e-commerce, hospitality, and marketplace solutions. It was founded in 2002 and is based in Hoofddorp, Netherlands. It operates as a subsidiary of Prosus.

Revolut operates in the finance sector and provides a digital banking platform. It offers financial services including money management tools, foreign exchange trading, cryptocurrency transactions, and investment services. The company serves individual consumers who want to manage finances. It was founded in 2015 and is based in London, United Kingdom.

Amazon Pay operates as a digital payment platform enabling online financial transactions in multiple sectors. It provides services including mobile recharges, bill payments, insurance premium payments, and gift card management. Amazon Pay is utilized within the ecommerce industry as a payment solution for consumers and merchants. It was founded in 2007 and is based in Seattle, Washington.