For input and choice components, the Label (key) (or “name”) is the key under which the value is sent in the flow response (e.g. screen_0_name_0). It is derived from the label (lowercase, spaces to underscores) but you can edit it. Use a short, unique key (e.g. email, appointment_date). Meta has a limit (e.g. 64 characters) for this key.
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