Available variables:
{success} (bool) if view could be rendered without problems (hash is correct, etc...)
{usergroups} (array) configured usergroups in plugin
{user} (User) Frontend User Object from email
{newsletter} (Newsletter) Newsletter object from email
{hash} (string) given hash
{data} (array) tt_content.* values from current plugin
{settings} (array) TypoScript and FlexForm settings
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