Energy which is transferred due to a temperature difference is sometimes known as heat or heat energy (or even thermal energy, although this is not a standard term). Conduction is sometimes described as a thermal energy transfer. You will have to decide if any of these terms are appropriate to your own scheme of work.
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Discover's policies are more intrusive. They state that a store employee who has doubts about the validity of a card should request and review additional identification from the customer. And for an unsigned card, the company requires two pieces of identification, including one government-issued photo ID. American Express is more vague.