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Then, of course, the page stops working. But any web dev that relies on client side scripting on a payments page should be barred permanently from the trade. Nothing sensitive or state-changing should ever be done client side (hence the invention of POST). It needs more expertise to do the job server-side, and that's the whole thing - fundamental lack of expertise in those tasked with mission- and security-critical systems development.
Biting the hand that feeds IT
