How to Test Guest Checkout API with Valid Test Products in Sandbox?

[muhasana_79]

I'm working with the eBay Buy API to initiate a guest checkout session using the following API URL:

https://apix.sandbox.ebay.com/buy/order/v2/guest_checkout_session/initiate

I always receive the following response:

{
  "errors": [
    {
      "errorId": 15018,
      "domain": "API_ORDER",
      "category": "BUSINESS",
      "message": "The item is not available for purchase. This can be for several reasons including the listing has ended. Remove the item and resubmit the call.",
      "parameters": [
        {
          "name": "itemId",
          "value": "v1|285365083585|587254101477"
        }
      ]
    }
  ]
}

Could anyone guide me on where I can get test products that can successfully go through the guest or member checkout process?