post https://buzz-key.api.beeswax.com/rest/campaign_experiment_assignment
This method is used to assign a Campaign and all of its Line Items to an Experiment in one POST. Other methods (PUT, GET, DELETE) are not supported.
See also Experiments.
Note: Since this method does not support DELETE methods, to remove the experiments you must PUT to each Line Item with "test_group_id":null and to the Campaign with "test_plan_id":null.