CARD ISSUING INFRASTRUCTURE

Crypto Card Issuing API for Fintech & Web3 Platforms

Build card issuing capabilities into your wallet, exchange, or fintech application. Connect card creation, card management, transaction events, and operational controls through a structured API integration.

Designed for businesses building branded virtual and physical card experiences through approved issuing and processing partners.

Request API Access Explore API Documentation

▸Card creation, status, and control operations
▸Transaction and lifecycle events via webhooks
▸Virtual and physical programs, issuer dependent

card-platform · illustrative console201 · request accepted

POST/v1/cardsIllustrative API example

request

{
  "customer_id": "cust_8f42…",
  "card_type": "virtual",
  "program_id": "prog_…",
  "idempotency_key": "req_01J…"
}

response

{
  "card_id": "card_5d21…",
  "status": "pending_issuance",
  "card_type": "virtual",
  "last4": "•• 4412"
}

VIRTUAL CARD

•••• •••• •••• 4412

CARDHOLDERissuing

Card creation requested — status returns to your backend.

Final issuance outcome is determined by the issuing partner.

CARD NETWORK OPTIONS

Build for the card networks your market supports.

Explore virtual and physical card program options across eligible networks and issuing partners. Network availability, supported regions, and card capabilities depend on the approved program structure.

VIRTUAL · PHYSICAL

•••• 4412

Visa

Visa programs

Card creation, status, controls, and transaction visibility where the program enables them.

Exploratory — confirmed during program design

PROGRAM OPTION

•••• 4412

Mastercard

Mastercard programs

Card creation, status, controls, and transaction visibility where the program enables them.

Exploratory — confirmed during program design

VIRTUAL · PHYSICAL

•••• 4412

Discover

Discover programs

Card creation, status, controls, and transaction visibility where the program enables them.

Exploratory — confirmed during program design

PROGRAM OPTION

•••• 4412

UnionPay

UnionPay programs

Card creation, status, controls, and transaction visibility where the program enables them.

Exploratory — confirmed during program design

Network names are shown for program exploration only. Availability is verified with the issuing partner for your markets before any commitment.

HOW IT WORKS

From your application to an active card.

Your application connects to the card platform through supported APIs. Card creation, lifecycle updates, and transaction events are coordinated through the relevant issuing and processing integrations.

STEP 1 OF 5

Customer Onboarding

Collect the required customer information and complete applicable identity verification before card issuance, according to the approved program requirements.

Customer application
Verification status
Onboarding completion

request direction response / event

your application

customer = collect_application()
verification = check_status(customer)
if verification == "approved":
    enable_card_creation(customer)

API ARCHITECTURE

A clear integration between your platform and card infrastructure.

Build your customer-facing experience while connecting the required card operations to approved issuing and processing systems. Keep responsibilities clear across your application, integration services, and regulated program partners.

LAYER A

Your Platform

Mobile application
Web application
Crypto wallet
User accounts
Your backend services

LAYER B

Nadcab Integration

API gateway
Card management orchestration
Event handling
Webhook delivery
Operational reporting
Integration monitoring

LAYER C

Approved Partners

Issuing partner
Card processor
Applicable verification providers
Settlement and program services

Authenticated API requestCard lifecycle responseTransaction eventWebhook notification

Final architecture and responsibilities depend on the selected issuing partner and commercial program arrangement.

INTERACTIVE API EXPLORER

Explore the card operations your application needs.

Understand the typical integration workflows behind card creation, management, and transaction visibility.

Create a card for an eligible customer.

Submit a card creation request after the customer has completed the required onboarding and verification steps. The issuing partner determines the final issuance outcome.

POST/v1/cardsIllustrative API example

Parameter	Type	Notes
customer_id	string	Verified customer reference from your system.
card_type	enum	virtual or physical, where supported.
program_id	string	Approved program configuration to issue under.
idempotency_key	string	Prevents duplicate cards on safe retries.

request

{
  "customer_id": "cust_8f42…",
  "card_type": "virtual",
  "program_id": "prog_…",
  "idempotency_key": "req_01J…"
}

response

{
  "card_id": "card_5d21…",
  "status": "pending_issuance",
  "card_type": "virtual"
}

Errors & edge cases

Handle validation errors per-field, treat timeouts as unknown outcomes (query status before retrying), and never create a second card for the same idempotency key.

Card lifecycle

none → pending_issuance → active / declined (issuer decision)

CARD LIFECYCLE

One integration. Multiple card experiences.

Support the card experiences your business needs, from digital-first card access to physical card programs, where supported by your issuing arrangement.

YOUR APP

VIRTUALACTIVE

•••• •••• •••• 4412

Coffee ••••$4.80

Transit ••••$2.40

Cloud ••••$19.00

FREEZEDETAILS

Digital cards built for immediate access after issuance.

Offer eligible customers a digital card experience inside your application, with supported card controls, transaction visibility, and account management.

Digital card access
Card status
Spending visibility
Supported freeze/unfreeze actions
Transaction history

PHYSICAL CARDYOUR BRAND

•••• •••• •••• 4412

CARDHOLDER NAMEVALID ••/••

Ordered — Card produced under the approved program
Dispatched — Delivery status tracked operationally
Delivered — Cardholder confirms receipt
Activated — Activation workflow completed in-app

Extend the experience beyond the screen.

Explore physical card issuance with supported card artwork, delivery workflows, activation processes, and card lifecycle management.

Physical card ordering where supported
Card artwork
Delivery status
Activation workflows
Replacement and lifecycle controls

SECURITY & TESTING

Build with security and operational control in mind.

Card issuing integrations require careful handling of customer information, authenticated requests, event delivery, and operational permissions. Design your integration around clear access boundaries and robust failure handling.

Request authentication flow

1 Your backend signs / authenticates the request
2 Credentials stay server-side — never in the app
3 Integration layer validates & routes the call
4 Issuer response recorded against your request ID

Webhook validation flow

1 Event received at your endpoint
2 Authenticity verified before trusting payload
3 event_id stored — duplicates dropped safely
4 2xx returned fast; processing runs async

Authentication & Access

Protect API access using the authentication methods supported by the integration, secure credential storage, restricted permissions, and controlled backend access.

Sensitive Card Data

Minimize exposure of payment credentials. Use approved tokenization and secure card-data handling mechanisms where required by the issuing arrangement.

Webhook Security

Validate event authenticity, handle retries, prevent duplicate processing, and maintain reliable event delivery records.

Sandbox Testing

Use available test environments to validate card creation, lifecycle updates, transaction handling, error scenarios, and webhook processing before production rollout.

Operational Monitoring

Track integration errors, processing failures, request outcomes, and operational exceptions to support reliable day-to-day management.

CAPABILITIES MATRIX

Understand what your integration can support.

Capability	Typical use case	Integration approach	Availability / dependency
Customer onboarding integration	Collect applications inside your app	Your UI + verification handoff	Program dependent
Card creation	Issue virtual/physical cards	API request via integration layer	Issuer dependent
Card status retrieval	Show live card state to users	API read / event sync	Supported where enabled
Card freeze / unfreeze	User & operator card controls	Control API actions	Issuer dependent
Virtual card management	Digital-first card access	In-app card experience	Supported where enabled
Physical card workflows	Order, deliver, activate cards	Fulfilment workflow + API status	Program dependent
Transaction history	Spending views & notifications	API reads + webhook events	Supported where enabled
Webhook notifications	React to events in real time	Signed event delivery	Requires confirmation
Operational reporting	Ops visibility & reconciliation	Reports / admin tooling	Program dependent
Cardholder management	Support & lifecycle operations	Admin workflows	Supported where enabled
Funding workflow integration	Connect balances to card spend	Conversion & settlement arrangement	Requires confirmation
Role-based administration	Control team permissions	Admin roles & audit trail	Program dependent

Availability labels are deliberately conservative: final capability depends on the issuing partner and program configuration confirmed for your business.

USE CASES

Built for businesses adding cards to existing products.

1Exchange balance↓
2Funding workflow↓
3Card account↓
4Spending activity

Crypto Exchanges

Extend an exchange experience with branded card functionality, subject to supported funding, conversion, and issuing arrangements.

1Wallet application↓
2Customer verification↓
3Card management↓
4Transaction events

Web3 Wallets

Give wallet users access to supported card experiences through integrated card management and transaction visibility.

1Fintech backend↓
2Issuing integration↓
3Customer card↓
4Admin monitoring

Fintech Platforms

Add card issuing capabilities to a broader financial application while maintaining a consistent customer interface and operational workflow.

IMPLEMENTATION SUPPORT

Plan your card integration with a technical team.

Discuss your existing application, API requirements, card products, target markets, and operational needs with the Nadcab team.

Talk to an Integration Specialist

What the first technical review covers

Your application architecture and backend readiness
Card products: virtual, physical, or both
Target countries and indicative card volumes
Funding methods and conversion requirements
Required API operations and webhook events
Issuing-partner fit and program dependencies

Crypto Card Issuing API — Frequently Asked Questions

Potentially, yes. Supported APIs can connect card-related functionality to an existing wallet application. The integration scope depends on your wallet architecture, funding workflows, and the selected issuing partner.

READY TO INTEGRATE?

Bring card functionality into your platform.

Tell us what you're building. We'll help you evaluate the available API capabilities, integration requirements, issuing dependencies, and implementation approach.

Request API Access Talk to an Integration Specialist Explore the Card Platform ↗

API capability review
Technical architecture discussion
Issuer-dependent program planning

Crypto Card Issuing API for Fintech & Web3 Platforms

Build for the card networks your market supports.

Visa programs

Mastercard programs

Discover programs

UnionPay programs

From your application to an active card.

Customer Onboarding

A clear integration between your platform and card infrastructure.

Your Platform

Nadcab Integration

Approved Partners

Explore the card operations your application needs.

Create a card for an eligible customer.

One integration. Multiple card experiences.

Digital cards built for immediate access after issuance.

Extend the experience beyond the screen.

Build with security and operational control in mind.

Authentication & Access

Sensitive Card Data

Webhook Security

Sandbox Testing

Operational Monitoring

Understand what your integration can support.

Built for businesses adding cards to existing products.

Crypto Exchanges

Web3 Wallets

Fintech Platforms

Plan your card integration with a technical team.

Crypto Card Issuing API — Frequently Asked Questions

Bring card functionality into your platform.

Crypto Card Programs

White Label Crypto Cards

Custom Branded Cards

Virtual & Physical Cards

Crypto Payment Gateway

Crypto Gift Card API

Our Global Presence

All

Crypto Card Issuing API for Fintech & Web3 Platforms

Build for the card networks your market supports.

Visa programs

Mastercard programs

Discover programs

UnionPay programs

From your application to an active card.

Customer Onboarding

A clear integration between your platform and card infrastructure.

Your Platform

Nadcab Integration

Approved Partners

Explore the card operations your application needs.

Create a card for an eligible customer.

One integration. Multiple card experiences.

Digital cards built for immediate access after issuance.

Extend the experience beyond the screen.

Build with security and operational control in mind.

Authentication & Access

Sensitive Card Data

Webhook Security

Sandbox Testing

Operational Monitoring

Understand what your integration can support.

Built for businesses adding cards to existing products.

Crypto Exchanges

Web3 Wallets

Fintech Platforms

Plan your card integration with a technical team.

Crypto Card Issuing API — Frequently Asked Questions

Bring card functionality into your platform.

Explore More Crypto Card Solutions

Crypto Card Programs

White Label Crypto Cards

Custom Branded Cards

Virtual & Physical Cards

Crypto Payment Gateway

Crypto Gift Card API

Our Global Presence

All