I have to build an advanced subscription form (= with calculation between a lot fields...), and after validate it, the visitor should be redirected to a securised payment plateform.
What is the way way to doing this with MODX ?
Mate don't look the way to do it in ModX, just look theway to do it, PHP, JS, etc...
I think there is not a "ModX way", the only path might be if you are using FormIt you will need a hook after the form is send or something like that to trigger the action.
You're right, I was looking a way to use FormIt of JsonFormBuilder to do this properly.
I'll dig further on this way.