Basecamp document, upload metadata, version, folder, and vault operations over JSON-representable routes. Generated from Basecamp's commit-pinned official OpenAPI 3.1 contract. The OAuth connection owns the bearer token and fixed https://3.basecampapi.com origin; every operation requires an explicit numeric accountId target and sends Basecamp's mandatory identifying User-Agent. Read caching is disabled. Every document, upload-metadata, version, folder, and vault read is marked sensitive-read and requires approval unless session-granted. Unsafe 64-bit JSON identifiers are preserved as exact decimal strings, and int64 request identifiers are accepted as strings and serialized without numeric rounding. Every mutation is grant-off and approval-gated.