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The shortcode should NOT include the normal square brackets ([ and ]). So, instead of you would use CF7_GET key=’493’ .
Any parameters in the shortcode must use single quotes. That is: CF7_GET key=’value’ and not CF7_GET key=”493”

https://www.improveprocess.net/test/

[showparam value]

[dynamictext dynamicname “CF7_POST key=’493’”]