WARNING endpoint deprecated. Instead use /customers/field Assigns or updates values to customer fields. The fields must already exist.

If a formatting error occurs in any of the fields an error code 400 will be returned and in that case no modification will be made. x-eov-operation-handler: customerFieldController

When using a field of type datetime, set the date according to ISO 8601 standard. E.g: 2021-10-22T10:46:23.897Z