we want to develop our current shopify to be a APP too, for the purpose likely a “quick path to buy” with the smartphone.
Is there any recommendation from the members where we need：
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use only the app can sync the info from shopify & officially support from shopify too, in order to prevent any incompatible if any upgrade from shopify. If possible, source from the shopify official APP directory in the shopify backend.
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must use the shopify payment gateway instead of one more payment gateway from that standalone app
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check with that app must support with any specific shopify award & loyalty app together and sync with any data