I’m traveling through Amesterdam, in transit. Can I buy apple products from your store in cash???

Do not buy an iPhone in transit the warranty won't work in your country, the repairs could be impossible or missing the proper components in your country and you won't be probably able to purchase an Apple Care+

https://business.gov.nl/regulation/rules-for-cash-payments/

You are not speaking to Apple here, but to other users.

Note that if you buy a phone in one country, intending to use it in another, there might not be a valid warranty for your home country. Your country might assess customs or import duties on the phone.

Hello ~ Call them and ask. I found this link…

Amsterdam - Apple Store - Apple (NL)

Shouting at someone trying to help you is not polite.

~Katana-San~

If you are planning to buy something in cash, it might be a good idea to check with the store that whatever currency you are planning to use is acceptable there.

The official currency of the Netherlands, which is part of the European Union, is the euro.