Delete a promotion
Only unassigned promotions can be deleted. It is possible to delete a promotion using the Engage ID or the external ID (if an external ID was used when creating the promotion).
Delete using Engage ID
To delete a multichannel promotion using the ID, use this endpoint:
DELETE /api/v3/promotions/multichannels/{id}
Where id is the Engage ID (31bc4f89-6e71-4086-8627-af8f01073331 or similar).
Delete using external ID
To delete a multichannel promotion using the external ID, use this endpoint with externalId as the query parameter:
DELETE /api/v3/promotions/multichannels?externalId=whatever