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A rate limit was exceeded (generic 429 fallback).
429 application/problem+json
Every PermitCore error is RFC 9457 application/problem+json. Branch on type (a stable URI), not on title or detail (human-readable, may change).

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When it occurs

A request-rate ceiling was hit. Quota exhaustion normally returns the specific monthly-requests-quota-exceeded / daily-requests-quota-exceeded codes; this generic variant is the fallback shape.

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How to fix

Respect the Retry-After header and back off. See Rate limits. Retryable — retry with exponential backoff (respect Retry-After on 429/503). See the full error catalog for the response shape and retry matrix. Every response carries an x-request-id header — include it in any support request.