Several things:

• %param{'key'} is just wrong; you mean $param{ 'key' } (I'm going to presume this was a typo or cut-and-pasteo)
• Likewise @param{'key'} while actually syntactically valid is a single element hash slice; again you probably want $param{ 'key' } here as well
• More than likely what you're calling expects an array reference, so you probably want $param{ 'key' } = \@array; (or possibly $param{'key'} = [ @array ] if you're worried that what you're calling might diddle the contents of the original @array)

See perlreftut and perlref for more details (and possibly swing through perldata for a refresher).

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