Using foreign currencies without a pricing context (i.e. country) is deprecated on Shopify API starting on April 2024. It is recommended to switch to the pricing context by setting a country for the price whenever a currency other than the default shop currency is used.
To adapt with the deprecation, pricing context is now mandatory for source currencies that are not default shop currency.
Current settings (pricing without a context) will continue to work until 31 Dec 2024. After 31 Dec 2024, a country will be selected based on best effort.