Rate limits

Each credential has its own requests-per-minute limit. All external API endpoints share the allowance for the same X-Api-Key.

Header	Meaning
X-RateLimit-Limit	Maximum requests in the window.
X-RateLimit-Remaining	Remaining requests.
Retry-After	Seconds to wait after a 429.
X-RateLimit-Reset	Unix reset timestamp when the limit is reached.

Respect Retry-After before retrying. A timed-out sales creation may already have succeeded: do not retry automatically. This initial contract does not guarantee idempotency, including through external_id.