Place it at the end of a purchase reveal, just as the total appears, then follow it with a Vine Boom for an expensive flex or a Bell Ding to underline the checkout moment.
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This is a short, bright electronic chime like the confirmation tone heard after a contactless Apple Pay transaction, lasting about a second and a half. It gives a quick sense of approval and relief, as if a payment has just gone through without a hitch. Apple introduced Apple Pay in 2014, and tones like this later became familiar shorthand for checkout success in videos and spending memes.