get https://a.klaviyo.com/api/campaign-messages//relationships/campaign/
Returns the ID of the related campaign
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
campaigns:read
Language
Authorization
Header
Returns the ID of the related campaign
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
campaigns:read