Timeouts

[pauldraper]

Needs timeouts, or better, to accept an AbortSignal.

I don't want to hang forever if Klaviyo API ever has issues 😓

[Ian-Montgomery-Klaviyo]

We will look into adding this in future release.

[alex-all3dp]

Real-world data point in case it helps prioritize.

We hit this on 2026-05-05/06 during a multi-hour Klaviyo API incident:

• ~21:04 UTC: API started accepting connections but never responding. With no client-side timeout in the SDK, requests hung until our Lambda was killed by its 30s runtime limit. 37 invocations died this way over ~2.5 hours.
• ~23:29 UTC: API started returning explicit errors (Cloudflare 525, then 404, then 503). SDK rejected fast -> that phase was handled properly by the SDK

Either approach from the original issue would have helped:

• A timeout option on ApiKeySession / ConfigWrapper passed through to axios (smallest change since axios() already reads config.timeout)
• Accepting an AbortSignal on each API method

Happy to put up a PR for the timeout-option approach if that would help.