Custom field values. Limited to 5000 characters total. Reserved system merge tags are ignored. If a field doesn’t exist, a new field is created. Supported types: string, date, json, int, float, url. Float precision is limited to 3 decimal places.Keys are case-insensitive — they are trimmed and lowercased on input, so SHOP, shop and Shop are treated as the same field. Two keys that differ only in case or whitespace in the same request are rejected as duplicates.
Subscriber tags. Limited to 2000 characters total and 50 characters per tag. Content overwrites current tags. Only updates if the parameter is present and update_existing is true. To clear all tags, send an empty array.
Force resubscribe if the subscriber was previously unsubscribed (status 2). If status is provided in subscriber_data, it takes precedence. For resubscribe to work, the status must be 1.
If the subscriber already exists in the list, the response includes already_subscribed: true.
The inserted_at field in the response returns the time in UTC format.