segment_id is no longer accepted

What changed

No error is raised. The value is ignored and your results change silently, which is the hardest class of break to notice.

Affects segment_id on GET /contacts. Grep for it: nothing else will tell you.

Who is affected

Code that sends GET /contacts (segment_id).

Before and after

Code that breaks

await client.post("/contacts", {
  // segment_id is now ignored, not rejected
  segment_id: value,
});

Based on Resend’s published API specification. How severity is decided.