Tutorial : How to Setup your store and add product
This will help you Setup your store the right way in test mode. if you do it this way your product will be listed all you have to do then is add your product to your store also load your file after you created your product in test mode. I also showed you how to test payments and you now have a clear wiev of what you can expect from paystack and what your customer receives when they pick a product and purchase from your store.