Follow the appropriate guide below to set up the account with your credit card payment provider.
PayPal - free and simple but support and dispute resolution can be very difficult
WorldPay - aimed at higher-turnover merchants, transaction fees under 5%
NetBanx -
recommended high per-transaction costs (4-8%) but flexible friendly service
Authorize.Net - US-only provider, good reviews and very configurable
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ProtX - friendly service for small businesses
SecPay - friendly service for small businesses