/api/service/frontend/unsubscribe-newsletter

E-mail address of the customer to unsubscribe.

Organisation slug to scope the unsubscribe.

Accepted formats:

• IPv4 dot-decimal, e.g. 1.1.1.1 (4 octets, 0–255, no leading zeros).
• IPv6 as defined by RFC 4291 — full 2001:0db8:0000:0000:0000:0000:0000:0001, zero-compressed 2001:db8::1, IPv4-mapped ::ffff:1.2.3.4, or scoped literals. Both upper- and lower-case hex are accepted.

Server-side canonicalization (ipNormalize in core/src/lib/network/ipNormalize.ts):

• Valid IPv4 is passed through verbatim.
• Valid IPv6 is lowercased (RFC 5952 §4.3).
• IPv4-mapped IPv6 ::ffff:X.X.X.X is unwrapped to plain IPv4 (RFC 4291 §2.5.5.2) so 1.2.3.4 and ::ffff:1.2.3.4 share one brj__geo_ip row.
• Loopback aliases (::1, 0.0.0.0, localhost, empty string) collapse to 127.0.0.1.
• Junk values that fail both IPv4 and IPv6 validation are silently rejected and replaced with 127.0.0.1 (loopback).

On the wire: every response returns the canonicalized form — clients can safely rely on lowercase IPv6 and the plain-IPv4 unwrap when de-duping or joining. Server-originated writers (activity log, session log, ban list) resolve the visitor IP via resolveClientIp / resolveClientIpOrNull — always native IPv6 on Vercel Edge (there is no auto-mapping to ::ffff:X.X.X.X).

Enrichment: the system resolves reverse DNS, geolocation, ASN, mobile/proxy/hosting/Tor flags via our VikiTron GEO/IP resolver for both address families. Learn more