How to make a POST + redirect using FormIt [MODX]?

Question

MODX

Hello, ALL
There is a simple payment form that collects preliminary information (name, soap, phone number, and so on), which is then transferred together with hidden fields to Yandex.checkout... The fields must be validated, this task is solved using FormIt. Since for validation to work, the action of the form must be on itself , it is not clear how to send it to Yandex.checkout after validating the form? Well, let's say I can send if I do &hooks=`yandex`, in which I can send everything I need via cURL. But I need to not only send, but also redirect the visitor there ... In general, help :)
UPD #1:To put it simply, I just need to send the form using the POST method to Yandex. The task, pancake, is nowhere more elementary. If it weren't for field validation. Is there a better way to validate? Not via FormIt?

Answer 1

&redirectTo try

Answer 2

jsfiddle.net/2L37sn0t/210

Answer 3

Possible without js
jsfiddle.net/2L37sn0t/213