# One Open API v2 - Vendor

**Canonical:** https://apis.io/apis/sms-assist/one-open-api-v2-vendor/  
**Provider:** SMS Assist — https://apis.io/providers/sms-assist/  
**Base URL:** https://meshlive.lessen.com/one-graph-vendor/graphql  
**Documentation:** https://developers.lessen.com/docs/#/vendor/overview

One Open API v2 - Vendor is one of 2 APIs that [SMS Assist](https://apis.io/providers/sms-assist/) publishes on the [APIs.io](https://apis.io/) network. The published artifact set on APIs.io includes API documentation.

GraphQL/HTTP API for vendors and affiliate technicians to manage assets (service and location assets), attachments, communications and messages, client lists, employees, locations, reactive and recurrent work orders, and invoices on the Lessen One Platform. Token-based auth via the /one-graph-vendor/token endpoint (HTTP Basic Auth to a bearer access_token).

## Machine-readable artifacts (3)

- **GraphQL** — https://meshlive.lessen.com/one-graph-vendor/graphql
- **Documentation** — https://developers.lessen.com/docs/#/vendor/overview
- **Sandbox** — https://meshstage.lessen.com/one-graph-vendor/graphql

## Other SMS Assist APIs (1)

- [One Open API v2 - Client](https://apis.io/apis/sms-assist/one-open-api-v2-client/)

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/sms-assist/one-open-api-v2-vendor/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/sms-assist/.