WorldPay is a part of The Royal Bank of Scotland Group, the 5th biggest banking group in the World, whose payment solutions are trusted by thousands of businesses, big and small.
Reference
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Pricing - https://www.worldpay.com/about_us/index.php?page=pricing
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Security - https://www.worldpay.com/about_us/index.php?page=security
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Products and Services - https://www.worldpay.com/about_us/index.php?page=services
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Acceptable Credit Cards - https://support.worldpay.com/products_services/services/cards.html