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sub get_inbox {
...
    $query->{after}  = $param{after}  if $param{after};
    [... more code snipped ...]
}

sub get_inbox {
    my ($self, %param) = @_;
...
### I ADDED THIS CODE TO DEBUG:
print Dumper(\%param);
exit();

$VAR1 = {
    'ARRAY(0x7ffbb4ba2768)' => undef
};