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$meta_value
(mixed) The original meta value
$meta_key
(mixedstring) The original meta key
$value_type
(string) The type name of the Maileon contact property to be updated
$maileon
(array) An array describing the Maileon contact fieldproperty
wc_maileon_contact_meta_values
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Since 1.2.8 wc_maileon_email_hooks now accepts array values. If an array is provided the first element is the replacement class name, the second is the constructor parameters.
See [1.2.x] Sample Extension for examples.
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