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Every plan can use these endpoints. A contact’s values are in its customFields, keyed by field name. Set them through create, update, upsert or bulk import. The list is paged: limit (1 to 1,000, default 100) and offset, oldest first. It returns { items, total, limit, offset, hasMore }; keep adding limit to offset while hasMore is true. type is one of text (the default), number, date or boolean.
A custom field