I had the same issue and it turned out to be a conflict with one of my custom modules. After disabling it, the payment methods loaded fine. If anyone’s using extra modules like customizable subscription billing services, double-check their compatibility—especially after any core updates. Sometimes clearing cache and switching to the classic theme temporarily also helps figure out what’s breaking things.
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I had the same issue and clearing the cache in both PrestaShop and my browser fixed it. Also double-checked that all payment modules were enabled and configured properly.