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Google checkout out throw Callback 503 error


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I recently upgraded my version to v5.1.5, but there is a problem with Google checkout payment gateway. Under my WHMCS, whenever I try to access to my Setup --> Payment --> Payment Gateway, I got prompt window asking for username and password with message of " A username and password are being requested by https://www.xxxx.com. The site says: "WHMCS Google Callback-503".


Even though I enter my Google merchant account ID and key, it keeps popping up the window. I've submitted the issue to WHMCS for 3 days without any response. Now my client cannot submit order because they got the same prompt when trying to place order.


Does anyone know what's the issue is? I also tried to remove Google checkout directly from database, but the entire configurepaymentgateway page just became blank after done that. Help~~~~~

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If I cancel the prompt window without entering any credential, I got a message says - Invalid merchant ID/ Key. So, I know it is looking for my merchant ID and key. I am pretty sure I've entered the correct ID and key, but still without luck.

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