Failed Pinterest posts aren’t an “API bug” problem — they’re an operations problem: retries, pacing, idempotency, and a place for failures to go. This guide breaks down what actually fails in production, which failures are safe to retry, and how to design an automated recovery loop with backoff, failure routing, and webhooks so humans only touch the real exceptions.

A practical reference for every Pinterest API error class — 400 through 500 — covering what triggers each, which are retryable, which are not, and how to handle them without guessing.