A red cross on API data on the Verify integration page implies that the request was unable to reach ShieldSquare instance. Ensure by verifying the following.
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You should be using Sandbox ID when verifying integration. When you use Production ID, Verify Integration page does not work.
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If any proxy or CDN is employed in front of your server, check if async is supported by them. If not, alter _async_http_post as false in the ss2_config file.
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The current version of the PHP connector will not support Async data post when hosted on the Windows server.