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# -- Sandbox Server:
BASE_GCO_SERVER = https://sandbox.google.com/checkout/cws/v2/Merchant/

sub order_item {
   my ( $item, $opts ) = @_;
...
   }
   return { redir => $response };
}

# -- Production Server:
BASE_GCO_SERVER = https://checkout.google.com/ws/v2/Merchant/