post https://app.kanta.fr/api/v1/customers/assignment
Provide an array of customers id. The assignment will affect them all. The array must contain at least one customer id.
When contributors array is provided, old contributors assignment will be erased. To keep them, add them in the new contributors array.
Provide null to unassign a supervisor or a firm. The unasigned supervisor will be replaced by the structure owner.
Provide an empty array to unassign all contributors.
Missing optional parameters will be ignored.