Third party APPS

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I am trying to connect my EPOS system to Shopify.

The EPOS system has an app designed by Junoconnect.

Each time I try to connect the APP, I am getting a "Cannot connect to server error"

I have spoken to the APP developers, but have not heard back from them in over five days

The EPOS system is by Clover, the APP developers are Junoconect.

I am worried because they also provide an APP for Magento 1, which is now dead and not supported for over a year, I'm just wondering whether or not they have not updated their Shopify to the latest version and this is what is causing the issue.

Can anyone help or advise ?