# Discover ProtectBuy 3-D Secure API

**Canonical:** https://apis.io/apis/discover-financial/protectbuy-3ds/  
**Provider:** Discover Financial Services — https://apis.io/providers/discover-financial/  
**Documentation:** https://www.discoverglobalnetwork.com/solutions/fraud-security/protectbuy/

Discover ProtectBuy 3-D Secure API is one of 4 APIs that [Discover Financial Services](https://apis.io/providers/discover-financial/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include 3D Secure, Fraud, Authentication, Payments, and United States. The published artifact set on APIs.io includes API documentation.

ProtectBuy is Discover Global Network's EMV 3-D Secure (3DS) cardholder authentication service. Built on the EMVCo 3-D Secure protocol, it lets merchants, acquirers, and 3DS servers authenticate Discover, Diners Club, and network-alliance cardholders at checkout, challenge high-risk transactions with a one-time password, and shift liability for card-not-present fraud across web, mobile, and connected-device commerce. Documentation and OpenAPI reference are published in the partner-gated Discover Developer Center; full specs require partner authentication.

## Machine-readable artifacts (3)

- **DeveloperPortal** — https://developer.discover.com/
- **Documentation** — https://www.discoverglobalnetwork.com/solutions/fraud-security/protectbuy/
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/discover-financial/refs/heads/main/apis.yml

## Other Discover Financial Services APIs (3)

- [Discover Secure Remote Commerce (Click to Pay) API](https://apis.io/apis/discover-financial/secure-remote-commerce/)
- [Discover Stored Token Services API](https://apis.io/apis/discover-financial/stored-token-services/)
- [Discover Deliver Push Payments API](https://apis.io/apis/discover-financial/discover-deliver-push-payments/)

## Tags

3D Secure, Fraud, Authentication, Payments, United States

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/discover-financial/protectbuy-3ds/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/discover-financial/.