I got, thanks for all!
The problem was that Vendor::Amazon had:
use base Vendor::Base;
one thing I did but couldn't associate with was:
use strict;
use base Vendor::Base;
then I realized that if strict goes after, no problem. Later I figured all out: base is the module and Vendor::Base is the parameter, so quotes are necessary around Vendor::Base. with strict after or without strict, no problem without quote.
That's it. Thanks again.
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