link => "/var/www/docs",
    name => "mydocs",
    link => "/var/www/read",
    name => "letters",
[download]

That is not possible, because hash keys must be unique, so there can only be one key link and one key name in each hash. However, a hash value can be a reference to an array or another hash, which can hold multiple values - for example, the data structure $added shown in the OP could be a hash value. But which data structure is best here depends very much on the sent function, which you haven't shown us. Is this a function you've written yourself, or is it from an existing module? What data format does that function expect?