get https://a.klaviyo.com/api/campaigns//relationships/campaign-messages/
Returns the IDs of all messages associated with the given campaign.
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
campaigns:read
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Returns the IDs of all messages associated with the given campaign.
Rate limits:
Burst: 10/s
Steady: 150/m
Scopes:
campaigns:read