While traveling in Japan, doing some or all of one's shopping for souvenirs or other items on Amazon can be an attractive option over physical stores, for example for the large range of items for sale (especially from third-party Marketplace sellers who ship only to Japan), the discounts offered, or the time saved. However, some travelers may be unwilling or unable to use their credit card to order, for example because it simply does not work, or charges exorbitant exchange fees, or because they have exchanged their whole travel budget in cash. What other payment options are available?
This is a question I am considering asking and answering because I have found such alternative payments options useful myself when travelling, but which could certainly be considered off-topic as it is "primarily about Amazon" (see the comments here). A credit card not working or charging hefty fees when used abroad is certainly an issue encountered mainly by travelers, but then again, so is receiving deliveries at hotels... Removing the "Amazon" part would certainly solve the problem, but would also make the question too broad if it means answers must apply universally to every online merchant. Maybe remove mentions of Amazon from the question but use it in an answer as an example?