get https://{hostname}/config-dns/v2/zones//zone-file
Download this zone's record set data in master zone file format. This operation applies to primary zones and secondary zones. See RFC 1035 section 5 and RFC 1034 section 3.6.1 for more information. AKAMAICDN and AKAMAITLC records can't be represented in this format, so they are displayed as comment lines.