# Capital One Authorizations API

**Canonical:** https://apis.io/apis/capital-one/authorizations-api/  
**Provider:** Capital One — https://apis.io/providers/capital-one/  
**Base URL:** https://api-sandbox.capitalone.com  
**Documentation:** https://developer.capitalone.com/products/authorizations?id=658618-1

Capital One Authorizations API is one of 14 APIs that [Capital One](https://apis.io/providers/capital-one/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Authorizations, Payments, and United States. The published artifact set on APIs.io includes API documentation.

The Capital One Authorizations API lets approved partners programmatically validate and authorize financial transactions against Capital One's platform in real time. It supports payment authorization decisioning and fraud-reduction workflows for merchants and fintechs integrating with Capital One card products. Access is OAuth 2.0 secured through DevExchange, with a sandbox for pre-production testing and a partner-approval gate for production. Reference material is HTML documentation on the portal; there is no publicly downloadable machine-readable specification.

## Machine-readable artifacts (1)

- **Documentation** — https://developer.capitalone.com/documentation/o-auth

## Other Capital One APIs (12)

- [Capital One Account Lookup API](https://apis.io/apis/capital-one/account-lookup-api/)
- [Capital One Credit Offers API](https://apis.io/apis/capital-one/credit-offers-api/)
- [Capital One Customer Transactions](https://apis.io/apis/capital-one/customer-transactions/)
- [Capital One Data Protection and Client Authentication Public Key Sharing API](https://apis.io/apis/capital-one/data-protection-and-client-authentication-public-key-sharing-api/)
- [Capital One Digital Auto Financing Credit Application API](https://apis.io/apis/capital-one/digital-auto-financing-credit-application-api/)
- [Capital One Enhanced Decisioning Data API](https://apis.io/apis/capital-one/enhanced-decisioning-data-api/)
- [Capital One In-Store Credit Card Payments API](https://apis.io/apis/capital-one/in-store-credit-card-payments-api/)
- [Capital One POS Credit Card Application API](https://apis.io/apis/capital-one/pos-credit-card-application-api/)
- [Capital One Partner Account Summary API](https://apis.io/apis/capital-one/partner-account-summary-api/)
- [Capital One Pre-Application Orchestrator API](https://apis.io/apis/capital-one/pre-application-orchestrator-api/)
- [Capital One Real-Time Proactive Prescreen API](https://apis.io/apis/capital-one/real-time-proactive-prescreen-api/)
- [Capital One Retrieve Consumer Bank Products API](https://apis.io/apis/capital-one/retrieve-consumer-bank-products-api/)

## Tags

Authorizations, Payments, United States

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/capital-one/authorizations-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/capital-one/.