To implement FEDEX shipping service on your website, use Fedex business shipping rates api. In this post i will explain you how to send XML request to get FEDEX shipping rates.
Fedex Shipping Rate XML Request in PHP:
This API code gives you Fedex business shipping rate list based on the Weight. If you need only one lowest shipping rate, than use ACCOUNT in RateRequestTypes instead of LIST parameter value in above XML request.
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Also must change Shipper and Recipient Address with your own Test Development Key Address. This address you got when you receive Developer Test key from Fedex. This is very much required otherwise you did not get Success Response. If facing any issue feel free to contact me. Thanks