When accessing https://applepaydemo.apple.com/payment-request-api, the "Approve with Side Button" prompt is displayed, but it does not appear when using our test domain.
I implemented the Payment Request API based on the sample source code from the following URL. On an iPhone device, the Apple Pay payment screen is displayed, but the "Approve with Side Button" icon below the amount does not appear, and instead a spinning loading icon is shown continuously.
Could you please help identify the cause?
■ Reference URL: https://applepaydemo.apple.com/payment-request-api
■ Changed parameter: "merchantIdentifier": "〇〇.dev"
■ Accessed domain: 〇〇test.com
■ Test device: iPhone 13 iOS: 18.4.1