I try to replace the old form handler with the new one you you wrote but I can't find documentation, the documentation is not available on TER.
Are there a document explaining how to migrate from old extension "phorax/formhandler" to this one.
For example, it seems that this TypoScript configuration :
plugin.Tx_Formhandler.settings.predef {
have to be changed like this :
plugin.tx_formhandler_pi1.settings.predef {
Are there other migration to do ?