regionstring
Amazon marketplace to read, as its domain (e.g. amazon.co.uk); omit it for amazon.com.
Possible values: amazon.com, amazon.co.uk, amazon.de, amazon.fr, amazon.it, amazon.es, amazon.nl, amazon.se, amazon.pl, amazon.ca, amazon.com.mx, amazon.com.br, amazon.co.jp, amazon.in, amazon.com.au, amazon.sg, amazon.ae, amazon.sa, amazon.com.tr, amazon.eg
