You can integrate ActiveCampaign with PadiAct by having email leads sent to ActiveCampaign as new subscribers.
In PadiAct, set up your connection to ActiveCampaign and choose your list:
Then choose what fields (from ActiveCampaign) you want to appear on the form:
When someone submits your PadiAct form (after you install it on your site), the data will be sent to ActiveCampaign.
There is also a plugin available for easy installation on your WordPress site.