Near checkout: trust at the moment doubt peaks
Near checkout, doubt peaks for a different reason. The buyer has decided, and now they are about to pay, which is when worries about delivery, returns, payment safety, and brand legitimacy return all at once. A review signal near checkout should be light, not a full review section: a guarantee stated plainly, a returns summary in plain language, a rating badge, or a short reassurance that support is monitored. The goal is to remove the last reason to pause, without adding a new distraction at the final step.
Clutter near checkout is the risk. A full review carousel, a pop-up, or a wall of badges at payment can pull attention away from paying, which is the opposite of what trust signals are for. Keep checkout trust short, honest, and relevant to payment: what happens after payment, how returns work, and how to reach a real person if something goes wrong.