Allowing double opt-in with mailerlite

I activated the double opt-in feature in mailerlite, but subscriptions through Hustle forms were still being automatically activated without passing through double opt-in. Mailerlite’s tech support helped me figure out that the Hustle plugin sends a parameter “type” in the subscription request that is set to “active.”

I found this parameter on line 129 of file wp-content/plugins/wordpress-popup/inc/providers/mailerlite/hustle-mailerlite.php:

'type' => 'active'

I’ve manually deleted this line for now in order to allow double opt-ins, but it would be nice to have a feature in the plugin to allow me to disable this instead of doing it in code.