DlainexOpen Third-Party Payment Platform for Merchants and ISVs

Unified pay, refund, transfer, inqury, query, and sync APIs with RSA signatures and merchant-aware channel routing.

Two Merchant Models

Agent merchants use transparent routing; special merchants can explicitly select upstream channels.

One integration covers pay, refund, close, transfer, transfer inqury, order query, and order sync.

Requests are verified with merchant public keys and responses are signed by the platform.

Separate OpenAPI files for agent and special merchants can be imported into Bruno directly.

English, Simplified Chinese, and Spanish docs support cross-region integration teams.

Error codes, callback rules, and sync APIs help teams troubleshoot and reconcile orders.

Choose the API document that matches your merchant model before starting development.

Merchant model	Channel handling	OpenAPI
Agent merchant	Upstream channels are transparent and selected by backend routing.	Agent merchant YAML
Special merchant	The merchant configures upstream channels and passes `channel` in trade requests.	Special merchant YAML

Unified trade lifecycle: pay, refund, close, transfer, transfer inqury, query, and sync.
Merchant-grade security: RSA request verification, response signing, nonce, request time, and trace ID.
Channel-aware routing: transparent routing for agent merchants and explicit routing for special merchants.
Debug-ready assets: OpenAPI files, request examples, response examples, and error-code references.

Confirm merchant type and download the matching OpenAPI file.
Configure merchant number, app ID, platform public key, and merchant private key.
Implement request signing and response signature verification.
Configure callback URLs and verify callback idempotency.
Test pay, refund, transfer, inqury, query, and sync flows in a test environment.