Julie, here from the Shopify Support team.
Placing a test order with your card reader is a great idea. While it's not possible to use the bogus gateway or the Shopify Payments test mode with in-person transactions, I would recommend testing it out by processing an order for a $1.00 quick sale item (you can refund the order later). Using the quick sale method also ensures you're not processing a transaction with an actual product, which would skew your inventory levels. I understand this isn't exactly what you're looking for, but this would be the easiest way to test out your audio jack card reader.
Are you getting ready for a pop-up event or trade show? If so, you might be interested in checking out our blog post, Pop-Up Shops 101: Everything You Need to Know to Try Temporary Retail. There's a wealth of great advice in there to help you plan, execute, and measure the success of your own pop-op event. I think you'll find it pretty useful.
Let me know if you have any further questions.
Julie | Social Care @ Shopify
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