Using this endpoint:
https://developers.klaviyo.com/en/reference/subscribe_profiles
Is it possible to subscribe a profile to a list and also add custom properties to that profile in one request? This was possible with the previous API version but now I’m not sure.
My request works without adding custom properties, but when I tried adding ‘newKey’ => ‘value’ to the Profile’s object and I got this error:
newKey' is not a valid field for the resource 'profile'
Thank you
Best answer by Brian Turcotte
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