1 Best APIs for Hosted Fields (PCI-DSS card capture) in Nigeria

Interswitch Group is Nigeria's pioneering payment infrastructure company and the creator of the Verve card network — the most widely used debit card in Nigeria with over 35 million cardholders. Founded in 2002 and listed on the Nigerian Stock Exchange, Interswitch owns and operates Nigeria's core payment switching infrastructure, connecting virtually all Nigerian banks. The company provides developer access to its infrastructure through the Interswitch Developer Center and the Quickteller Business platform. What the API Does The Interswitch API ecosystem covers multiple products: (1) Quickteller SVA — access to 3,000+ billers for airtime vending, utility payments, and transfers to all Nigerian banks and selected African mobile wallets; (2) Quickteller Business — a comprehensive payment gateway for card acceptance, USSD, QR, hosted fields, and mobile SDKs; (3) Virtual Accounts — for NGN collections via dedicated account numbers; (4) NIP Instant Transfers — for bank-to-bank transfers across the Nigerian banking system. How Developers Use It Developers sign up at developer.interswitch.com, create an app in the developer console, and obtain a Client ID and Secret Key for OAuth 2.0 authentication. The API uses standard OAuth 2.0 authorization to generate access tokens. A sandbox environment is available for testing with test credentials. Integration options include REST API, hosted fields (for PCI-compliant card capture), web gateway, and mobile SDKs. Pricing Integration is free — no setup or monthly fees. Local transactions (cards, USSD, QR): 1.5% capped at ₦2,000. 7.5% VAT applies to all transaction fees. Volume-based custom pricing available for high-volume merchants — contact sales. Authentication OAuth 2.0 using Client ID and Secret Key from the developer console. Access tokens are generated and included in API request headers. Token expiry and refresh are managed per OAuth 2.0 standards. Compliance Interswitch is CBN-licensed, PCIDSS certified, and regulated as a switching and processing company under Nigerian financial regulations. As an NSE-listed company it is subject to SEC and public disclosure requirements. Challenges and Gotchas (1) OAuth 2.0 is more complex to implement than simple Bearer token APIs — requires proper token management. (2) Quickteller SVA and Quickteller Business are separate products with different documentation. (3) Settlement takes up to 48 hours — not instant. (4) Verve card processing is Interswitch's core strength; for international card processing, competitors like Paystack may offer better rates. Company Background Interswitch was founded in 2002 by Mitchell Elegbe in Lagos. The company processes hundreds of millions of transactions monthly and serves over 40,000 merchants across Nigeria. Interswitch is valued at over $1 billion, making it one of Africa's fintech unicorns. Products include Verve, Quickteller, Paydirect, and eClat. FAQs Q: What is the fee for local card transactions? A: 1.5% capped at ₦2,000, plus 7.5% VAT on the fee. Q: Does Interswitch support 3,000+ billers? A: Yes. Quickteller SVA gives access to airtime, utilities, and thousands of Nigerian billers. Q: What authentication does Interswitch use? A: OAuth 2.0. You get a Client ID and Secret Key from the developer console to generate access tokens. Q: Is there a sandbox? A: Yes. Available at developer.interswitch.com with test credentials.