how to using partial refund in Cybersource Simple Order API

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The refund(credit) could be found at Table 21 in page 77.

http://apps.cybersource.com/library/documentation/dev_guides/CC_Svcs_SO_API/Credit_Cards_SO_API.pdf#.../omegleshagle

Had anyone experience, using cybersource partial refund.

How to know the refund api domain?

Thanks for your reply!