Reference and helper for the PopNow AI generation API (api.popnow.ai) - API keys and auth, the model catalog and input schemas, the async task lifecycle (quote, createTask, recordInfo polling, wait, retry, purge), credits and holds, error codes, rate limits, idempotency keys, webhooks with signature verification, file uploads, the asset library and the OpenAI-compatible /v1/videos endpoints. Use when writing or debugging code that integrates PopNow, answering questions about how the PopNow API works, or running a PopNow call not covered by the video, image, audio or effects skills.