Since the error relates to casting a list into a string and you have these 3 lines 

Accept: text/xml
Accept: multipart/*
Accept: application/soap

the problem might be related to this bug report Issue with HTTP.pm

Try adding this line

$client->transport->http_request->header(
   Accept => 'text/xml, multipart/*, application/soap');

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poj

In reply to Re: SOAP::Lite headers by poj
in thread SOAP::Lite headers by eukiph

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