I’d like to change my default currency from USD to AED but have already made sales. I’ve been trying to find out how to contact Shopify Support but have not had any luck.
I also want to know if it’s possible for customers to checkout in multiple currencies?
The only way to change the default currency after 1st sale is by contacting Shopify support.
Contact page: https://help.shopify.com/en/questions#/contact/
A guide to enable multi-currently, please see this help document:
https://help.shopify.com/en/manual/payments/shopify-payments/multi-currency/setup