Manage Housecall Pro price book items and attach line items to jobs/estimates via the API

Steps

1. Authenticate with your API key and list existing price book items to get valid item IDs, pricing, and categories
2. Add a line item to a job using the job line-items endpoint, referencing either a price book item or a custom ad-hoc line item
3. For adding many line items to the same job at once, use the bulk line-item update/create request instead of looping single-item calls
4. Apply the same line-item pattern to estimates if you need pricing to match between an estimate and the job it becomes
5. Re-fetch the job or estimate afterward to confirm totals recalculated correctly with tax and discounts applied
6. Keep local price book caches in sync by periodically re-listing price book items, since there isn't a guarantee your integration will be notified of every price change