A payment gateway is a merchant service provided by an e-commerce application service provider that authorizes credit card or direct payments processing for e-businesses, online retailers, bricks and clicks, or traditional brick and mortar.
WePay is an online payment service provider based in the United States that provides an integrated and customizable payment solution through its APIs to platform businesses such as crowdfunding sites
Braintree, a division of PayPal, is a company based in Chicago that specializes in mobile and web payment systems for ecommerce companies.
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