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Klick-Tipp Opt-in Process
Add an option to select a default Opt-In Process for new subscribers with Klick-Tipp.
https://support.klicktipp.com/article/394-php-wrapper
“ID of the double-opt-in process (open the menu “Automatisierung” and choose “Double-Opt-In-Prozesse.” You will find the ID at the top of the table.”
Jack Arturo shared this idea 
This is complete and was released today in v3.40.41. After updating, click Refresh Available Tags and Fields one time to load the available Opt-in Processes. Then you can select a default Opt-In Process for new contacts from the General tab in the WP Fusion settings.