"Is there a variable that I can modify based on JS conditions I set?"
"Or something like allowNext = boolean?"
It took me way too long to understand what he was getting at.
But basically, he wanted the e-mail address and password to be entered in the first step of his registration form and all other information in the second step.
But only for people with valid emails that are neither from competitors nor personal use.
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Well. Here is a quick video that shows you how StudioForm's unique "sf-promise-resolve" attributes solves exactly that: