Pagination

List endpoints return a list object:

{
  "object": "list",
  "data": [],
  "has_more": true,
  "next_cursor": "cur_9f2b1c7a4d"
}

Pass limit (1–100) to size a page and cursor to fetch the next one. Keep following next_cursor while has_more is true. Cursors are opaque — don't decode or construct them.