Without Shopify payment support, I am looking for WMS optimized & simple traceable app with Shopify

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Hello everyone and Shopify experts!!!!

I am looking for a WMS(Warehouse Management System) app optimized or integrated well with Shopify.

My shop doesn't have Shopify payment because Shopify does not support "Shopify payment" in Korea.

So I have limits in the selection of the WMS app.

Since I only have less than 10 SKUs (less than 10 different products), and the monthly order is less than 100, I only need a small app to control and trace products.

Since the number of orders is small but each product is over 500 US dollar value, I want to be able to trace them with serial numbers.

In the future, when my order reaches more than 100 each month, I am willing to subscribe but as a start, we need a free app. I appreciate your help and recommendation.

Thank you so much.