Ok, here is the long story 🙂
The form it's being processed by a 3rd party script (company) for collecting data. This script is just collecting data and redirect the user to a thank you page. Nothing more.
I want to process the form with a local script for form validation (PHP validation). ATM there is a JS validation.
If the form submission is ok, I want to redirect to the 3rd party script, without loosing the $_POST data.
Thanks