Update Segment Keys in Environment via CSV

Bulk upload a CSV file containing a list of identifiers. The segment must exist before calling this endpoint. Segments are limited to 100,000 members and each call can only include 10,000 new members at a time. This endpoint requires a CSV file in the file form field; path parameters and optional query parameters control which segment and environment are affected.

👍 Tip

On the Enterprise plan, you can create large segments (that can contain over 100,000 members).

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