You can integrate with the AlipayHK Barcode solution and get specific services. To use a specific service, you need to send an HTTP/HTTPS request to Alipay and use keys to sign the request before you send them. After receiving the request, the Alipay system verifies the request. If the verification is passed, the Alipay system responds the result data to you. You can first make a test in the sandbox before going live.