🧩 Fix: ERR_INVALID_PARAMS

Quick fix

Read error_detail.message in the response: it names the parameter. The usual causes:

• More than 100 identifiers in ids (or in identifiers on POST /v1/products/batch). Split the request.
• A price-history window longer than 366 days, or a start/end date that is not YYYY-MM-DD.
• A schedule other than hourly, daily or weekly.
• A webhook without a url or events, an unknown event type, or more than 5 webhooks on the account.

Why this happens

The API checks limits before doing any work, so an over-limit request is rejected with HTTP 400 instead of being partly served. No credits are charged.

Other fixes

• For long histories, request successive windows of up to 366 days.
• Valid webhook events are price_drop, availability_change and schedule_completion.

Related errors

• ERR_IDENTIFIER_REQUIRED: no identifiers in ids.
• ERR_RATE_LIMIT: more than 1,000 requests in the rolling hour.

Full reference: Data API errors.