# TransUnion Signing API

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

TransUnion Signing 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 Signing. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

Used to construct a PASSporT "shaken" JSON Web Token, a PASSporT "div" JSON Web Token or a PASSporT "rph" JSON Web Token. Also, referred to as the Secure Telephone Identity Authentication Service (STI-AS).

## Operations (1)

| Method | Path | Summary |
|---|---|---|
| POST | `/signing` | Signing (STI-AS) Request |

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/transunion/refs/heads/main/openapi/transunion-signing-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 Authentication Service API](https://apis.io/apis/transunion/transunion-authentication-service-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

Signing

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