XF 2.2 -> 2.3 Ajax form submission help

[stromb0li]

In converting the jQuery implementation of one of the payment providers I am trying to help support, I'm running into a challenge on handling AJAX requests and form submission.

Here is a working implementation in XF 2.2 with jQuery approach:
https://raw.githubusercontent.com/JackStromberg/bdPaygateAuthorizeNet/refs/heads/v1.4.1/js/Xfrocks/AuthorizeNetArb/payment.js

Here is the XF 2.3 vanilla JS implementation that does not follow the same submit behavior...

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XF 2.2 -> 2.3 Ajax form submission help

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