Rename a snippet, replace its body, or archive/restore it. Updates apply on the next send of any email that references the snippet via {{ snippet.key }} — there's no per-email versioning, so a content change ripples to every broadcast or sequence email using that key.

The request body must match the existing snippet_type. For an inline snippet, send content (and optionally name, archived). For a block snippet, send document_attributes.value_html (and optionally name, archived). Pass archived: true to archive, false to restore.

Warning: snippet_type is immutable. Sending a different value, or sending the body shape for the wrong type, returns a 422 with snippet_type cannot be changed.

See Create a snippet for the full snippet model and how key ties into Liquid.