# FlashExpress Open API

**Canonical:** https://apis.io/apis/flash-express/flash-express-open-api/  
**Provider:** Flash Express — https://apis.io/providers/flash-express/  
**Base URL:** https://open-api.flashexpress.com  
**Documentation:** https://open-docs.flashexpress.com/

FlashExpress Open API is published by [Flash Express](https://apis.io/providers/flash-express/) on the [APIs.io](https://apis.io/) network. Tagged areas include Shipping, Logistics, Parcel Tracking, Order, and Webhook. The published artifact set on APIs.io includes API documentation, an API reference, and authentication docs.

The FlashExpress Open API is the merchant-facing integration surface for Flash Express parcel logistics in Thailand. All calls are HTTPS POST with an application/x-www-form-urlencoded body and a JSON response envelope of code/message/data. Every request is authenticated with a merchant id (mchId), a random nonce string (nonceStr) and an uppercase SHA256 signature (sign) computed over the ASCII-sorted non-empty parameters joined with a merchant secret key issued by Flash Express support. The API covers warehouse listing, the Flash standard address/location tree, sub-account creation, order creation (including creation against a merchant-supplied tracking number), order modification and cancellation, single and batch parcel route tracking, delivered-proof retrieval, 100x180mm and 100x75mm label pre-print, freight-rate estimation, courier pickup notification scheduling and cancellation, and webhook subscription management.

## Machine-readable artifacts (9)

- **Documentation** — https://open-docs.flashexpress.com/
- **APIReference** — https://open-docs.flashexpress.com/#api-reference
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/authentication/flash-express-authentication.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/conventions/flash-express-conventions.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/errors/flash-express-error-codes.yml
- **Webhooks** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/asyncapi/flash-express-webhooks.yml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/data-model/flash-express-data-model.yml
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/sandbox/flash-express-sandbox.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/flash-express/refs/heads/main/apis.yml

## Tags

Shipping, Logistics, Parcel Tracking, Order, Webhook, Cash on Delivery

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