Assigns or updates values to customer fields. The fields must already exist, if the customer does not exist, create it.

Fields that do not exist will be ignored.

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. Unless ignoreErrors is set to true

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

To enable or disable a customer a internal field _enabled can be used with values true or false.

Deleting a customer field value: leaving a cell empty or setting it to null removes the corresponding customer field record entirely. Subsequent existence filters (isnull) will match these customers.