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API v2 compatibility fixes

Older API keys without the secret_ prefix work on /v2 again, and email and domain responses return the documented fields.

Updated Sep 28, 2026

FixedREST APIAPI keysEmail APISending domains

  • API keys created before keys had the secret_ prefix are accepted on /v2 again.
  • Retrieve an email returns the full email object, including object, from and to.
  • Domain responses return track_loads and track_clicks as 0 or 1, as documented.
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