Square Sync Broken

Square Sync is Broken, and the conversation with the customer support agent is outrageously off-base, and NOT helpful. I'm ready for a refund and to look in a different direction. They've asked me for screenshots, which I've sent, to which they've responded with really weird suggestions that do not address the problem. They've suggested that I go to the URL settings and make sure Shipstation is whitelisted (how can I do this with Square???) This is an API issue: if the APY sync is not working please just tell me that, don't make up other stuff and send me down the rabbit hole of other issues that you're inventing