# TransUnion Authentication Service API

**Canonical:** https://apis.io/apis/transunion/transunion-authentication-service-api/  
**Provider:** TransUnion — https://apis.io/providers/transunion/  
**Base URL:** https://{hostname}:{port}/{optionalRoutingPath}  
**Documentation:** https://neustar.github.io/tcs-apis/

TransUnion Authentication Service API is one of 7 APIs that [TransUnion](https://apis.io/providers/transunion/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include AuthenticationService. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API endpoint uses the following data elements ('required' elements identified) in the REQUEST to create a SIP Identity header. Based on the HTTP header of 'Content-Type' (e.g. json, text/plain), the request body (data) can include various data elements. Please refer to the examples for more details. Three different API entry points are defined for SIP Identity header creation: * Accepts requests in JSON format and produces responses in JSON format * Accepts text messages in text/plain and produces responses in JSON format * Accepts text messages in text/plain and produces responses in text/plain format

## Operations (5)

| Method | Path | Summary |
|---|---|---|
| POST | `/authn/v2/identityj-j` | Request & Response in JSON Format |
| POST | `/authn/v2/identitys-j` | Text Message & Response in JSON Format |
| POST | `/authn/v2/identitys-s` | Text Message & Response in Text Format |
| POST | `/authn/v2/identitymps` | Multipart - Text/JSON Message & Response in Text Format |
| POST | `/authn/v2/identitympj` | Multipart - Text/JSON Message & Response in JSON Format |

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/openapi/transunion-authentication-service-api-openapi.yml
- **Documentation** — https://neustar.github.io/tcs-apis/
- **APIReference** — https://neustar.github.io/tcs-apis/
- **SourceCode** — https://github.com/neustar/tcs-apis
- **Solutions** — https://www.transunion.com/solution/trucontact/branded-communications/trusted-call-solutions

## Other TransUnion APIs (6)

- [TransUnion Global Developer Portal](https://apis.io/apis/transunion/global-developer-portal/)
- [TransUnion TruValidate Device Risk](https://apis.io/apis/transunion/truvalidate-device-risk/)
- [TransUnion Signing API](https://apis.io/apis/transunion/transunion-signing-api/)
- [TransUnion Verification API](https://apis.io/apis/transunion/transunion-verification-api/)
- [TransUnion Verification Service API](https://apis.io/apis/transunion/transunion-verification-service-api/)
- [TransUnion Verification Service with Call Validation Treatment (CVT) API](https://apis.io/apis/transunion/transunion-verification-service-with-call-validation-treatment-cvt-api/)

## Tags

AuthenticationService

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