| string | name | Name of the merge field
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| bool | req | Denotes whether the field is required (true) or not (false)
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| string | field_type | The "data type" of this merge var. One of: email, text, number, radio, dropdown, date, address, phone, url, imageurl
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| bool | public | Whether or not this field is visible to list subscribers
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| bool | show | Whether the list owner has this field displayed on their list dashboard
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| string | order | The order the list owner has set this field to display in
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| string | default | The default value the list owner has set for this field
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| string | size | The width of the field to be used
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| string | tag | The merge tag that's used for forms and listSubscribe() and listUpdateMember()
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| array | choices | For radio and dropdown field types, an array of the options available
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