The Stanbic IBTC MyBluePay Gateway Plugin for Opencart is a great way to start accepting payments from Nigeria.
Payment Gateways
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eTranzact
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MasterCard (Online Shopping Malls, Telemarketing, Online Pharmacy, Clubs, Bill Payment Sites)
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InterSwitch (Online Shopping Malls, Telemarketing, Online Pharmacy, Clubs, Bill Payment Sites)
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Visa (Local and FX)