if you're the merchant and have Internet, you don't need to trust anyone. the payer can remain offline.
generally, one party having internet is enough to prevent double spending
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also this is a surprisingly common situation throughout the world
merchant has internet, customer does not
yes, merchant usually doesn't move, customer does!
the opposite could also exist, tho probably less common:
vending machine (offline) - customer mobile (online)
in that case, customer/sender can create offline verifiable tokens