For SIM, the hosted checkout page isn't applying the html supplied in the x_header_html_payment_form field anymore. Instead, it is just displaying the raw HTML as text. The code used to work right, but now has stopped working properly.
Here's a screenshot:
No idea why this doesn't work anymore. My code has not changed for a few months.
I've tried a few variants, and it doesn't matter whether I send the x_header_html_payment_form as a hidden input or a textarea, nor whether the angled brackets are escaped or not. It still just displays the raw HTML as text rather than applying it.
