We recommend that you enter an image URL for your custom page style only if the image is stored on a secure server. If the image is not stored on a secure server, your customer's web browser will display a message that the payment page contains insecure items.
You can determine whether or not your image is stored on a secure server by examining its URL. The URL for an image on a secure server will begin with https:// instead of http:// (Note the additional s.)
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