Card issuing APIs
Card issuing APIs are application programming interfaces that allow businesses to create, fund, control, and manage payment cards programmatically. They let platforms issue virtual and physical cards at scale, configure spend controls, and integrate card management into their own systems without manual card program administration.
Card issuing APIs expose the full lifecycle of a payment card as programmatic operations. An API call can create a virtual card in milliseconds, set spend controls, fund the card balance, and return the card credentials. This lets platforms embed card issuance directly into their user onboarding or workflow triggers.
The functional scope covers creation, configuration, funding, transaction retrieval, and lifecycle management. Create APIs generate card credentials with specified parameters. Control APIs set or modify spend rules. Balance APIs manage card funding. Transaction APIs retrieve authorization history in real time. Lifecycle APIs handle card suspension, replacement, and cancellation.
For embedded card programs, the API is the entire control plane. Platform engineers configure card programs, manage cardholders, and automate lifecycle events through the API, without a separate card program management portal. This API-first approach enables programmatic card management at any scale.
Manual card program administration does not scale. Issuing, funding, and managing thousands of corporate cards or virtual payment cards requires automation that only API-native card infrastructure can provide. Card issuing APIs enable platforms to build fully automated card workflows, from onboarding-triggered card creation to offboarding-triggered card cancellation, without human intervention.
- Card issuing API integration requires developer investment and thorough testing
- Physical card production introduces delays that API calls cannot eliminate
- Spend control configuration logic requires careful design to avoid unintended declines
- Compliance data requirements must be passed in card creation API calls
- API latency must be within acceptable bounds for real-time card creation use cases
A procurement automation platform integrates Nium's card issuing API to create single-use virtual cards for each approved purchase order. When a PO is approved in the ERP system, a virtual card is automatically created with the exact PO amount, locked to the vendor's MCC, valid for 30 days. When the vendor charges the card, payment is captured automatically. Finance team time on payment processing drops by 90%.
Related Concepts
Nium's card issuing APIs give full programmatic control over card program management: card creation, spend control configuration, balance management, transaction retrieval, and lifecycle management, through a unified REST API. The same API powers physical and virtual card programs across Visa and Mastercard networks, and connects to Nium's stablecoin-backed card capability for programs that fund cards with stablecoins.
Answers you didn't know you needed.
What can I do with a card issuing API?
Create virtual and physical cards, set and modify spend controls, fund card balances, retrieve real-time transaction data, and manage card lifecycle events, all programmatically through API calls.
How quickly can a virtual card be created via API?
Virtual cards are created in milliseconds via API. The card credentials are returned in the API response immediately, ready for use without any production or delivery delay.
Can card issuing APIs be connected to business system triggers?
Yes. Card issuing APIs can be called from any business system event, such as ERP purchase order approval, HR onboarding, or expense system budget approval, enabling fully automated card workflows.
What programming languages does Nium's card issuing API support?
Nium's card issuing API is a REST API using standard HTTP and JSON, compatible with any programming language that can make HTTP requests.
How does authentication work for card issuing APIs?
Nium's APIs use API key authentication for system-to-system integration. All API calls require TLS encryption in transit.