$fedex->setCarrierCode("FDXG");

After this I found few bugs witch I fixed and now you can download updated FedEx class from this post.

Before you begin:
FSM Direct Site Registration: To register in the FSM Direct program, go to http://www.fedex.com/us/solutions/wis/. Register and complete the brief registration form.

Steps for developing your own communications protocol and integrating it into your application are listed below.

• Read and accept the FedEx Ship Manager Direct license agreement.
• Review the FedEx Direct Documentation: Determine if this alternative or FedEx API is appropriate for your application.
• Develop your application.
• Send an email to websupport@fedex.com. Request to be set up for testing. Attach FedEx Express and/or FedEx Ground account number(s).
• Test your application.

All documentation can be found here:

http://www.fedex.com/us/solutions/wis/pdf/fsm_directmanual.pdf

http://www.fedex.com/us/solutions/wis/pdf/xml_transguide.pdf

Here’s more about this class

How to use this Fedex rates class:

    $fedex = new Fedex;
    $fedex->setServer("https://gatewaybeta.fedex.com/GatewayDC");
    $fedex->setAccountNumber(123123123);
    $fedex->setMeterNumber(12312312);
    $fedex->setCarrierCode("FDXE");
    $fedex->setDropoffType("REGULARPICKUP");
    $fedex->setService($service, $serviceName);
    $fedex->setPackaging("YOURPACKAGING");
    $fedex->setWeightUnits("LBS");
    $fedex->setWeight(17);
    $fedex->setOriginStateOrProvinceCode("OH");
    $fedex->setOriginPostalCode(44333);
    $fedex->setOriginCountryCode("US");
    $fedex->setDestStateOrProvinceCode("CA");
    $fedex->setDestPostalCode(90210);
    $fedex->setDestCountryCode("US");
    $fedex->setPayorType("SENDER");

    $price = $fedex->getPrice();

All available variables can be found here: http://www.fedex.com/us/solutions/wis/pdf/xml_transguide.pdf (FDXRateRequest)

Possible Fedex answer:

fedex Object
(
    [server] => https://gatewaybeta.fedex.com/GatewayDC
    [accountNumber] => 123123123
    [meterNumber] => 12312312
    [carrierCode] => FDXE
    [dropoffType] => REGULARPICKUP
    [service] => STANDARDOVERNIGHT
    [serviceName] => FedEx Standard Overnight
    [packaging] => YOURPACKAGING
    [weightUnits] => LBS
    [weight] => 17
    [originStateOrProvinceCode] => OH
    [originPostalCode] => 44333
    [originCountryCode] => US
    [destStateOrProvinceCode] => CA
    [destPostalCode] => 90210
    [destCountryCode] => US
    [payorType] => SENDER
    [price] => price Object
        (
            [service] => FedEx Standard Overnight
            [rate] => 86.37
            [response] => Array
                (
                  ...//Here is full xml response
                )
        )
)

Click here to download FedEx shipping rates calculator class

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