jdbertron

Well, I got it working. I had to learn how forminator works.
It turns out one of the payment filters allows that early substitution.
For anyone looking for something similar:
https://github.com/BqETH/forminator-bqeth-hash

Thanks for you help !

Ok, that worked, but now, what I really wanted was to use this hidden-1 field in the redirect behavior, but it looks like that value gets replaced before I have a chance to calculate it. Is there another hook I can use that would give me a chance to calculate the value and save it before the redirect replacement ?

Thank you very much !
This will work perfectly.

BTW, I’m also looking at this, trying to make sense of how this works.
https://github.com/pentatonicfunk/forminator-addon-yafa-plugin