Payment issue with 3 digits currency

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Hello guys,

I am working on one client's store in Oman (neighbour of Saudi Arabia and Emirates), but their custom is to use 3 digits in their currency. This is natively supported by Shopify, however it causes problem with payment gateways, that are not used to this.

Do you have an experience how to remove the 3rd digit to use standard payment gateways like

Screenshot 2020-09-10 at 06.05.53.png