Shopify POS Hong Kong

So I've worked with several clients using Shopify & Shopify POS and have been getting mixed answers from Shopify customer service.

Is the Shopify POS only compatible with Stripe? I have been told it will also work with gateways such as Authorize.net by Shopify customer service. But a few of my clients have also been told it will only work with Shopify Payments (aka stripe). I have created a test account myself which did allow me to plug in a gateway.

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