huang wei c14c020a3c fix some bugs (#277) ...

* fix payRequset xml marshal: root element should be xml

* support HMAC-SHA256 for unifiedorder api

* support HMAC-SHA256 for PaidVerifySign

* fix SignType is nil

* fix code style

* constantize SignType

* add comments

* fix code style

2020-06-14 23:23:58 +08:00

540 B

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