API Security Best Practices for POS Systems
Practical rules for protecting API keys, tenant data, and checkout flows when building with NoPOS.
The NoPOS developer relations team writes practical guides for building on the NoPOS REST API — from first smoke test to production POS.
POS and commerce front ends touch sensitive operational data. Treat API integration security as product work, not cleanup.
Keep keys server-side
NoPOS API-key calls use the X-API-Key header. Do not put a live key in browser JavaScript, mobile bundles, screenshots, prompts, or client-visible logs. Proxy calls through your own server route or serverless function.
Verify before building
Call GET /v1/auth/verify during setup and deployment checks. A good integration confirms the scoped store_id before enabling deeper workflows.
Handle errors intentionally
Non-2xx responses return JSON with an error or message field. Show safe user-facing messages, log enough detail for support, and avoid dumping raw request bodies into client logs.
Use generated contracts
Use OpenAPI for typed clients and AGENTS.md for AI tool context. Both reduce the chance that a code generator or agent creates an endpoint that does not exist.
Build from the current contract
Open the gateway for OpenAPI, Swagger, AGENTS.md, llms.txt, and the first X-API-Key smoke test.