Catalogue
Import product variants so Outpost can classify them for tax - for example mapping a SKU to a Brazil NFS-e service code. Approved catalogue codes are operator-facing today - calculations still determine tax per line item at request time from the product codes you send.
Use this when you maintain a product catalogue outside Outpost and need Outpost to know how each variant should be taxed. Skip it if you only ever pass fully specified line items and do not need Outpost-side classification.
API map
Request and response schemas live in the API reference.