Hello I have used Advanced Custom Fields to create a multi-select key value pair custom fields for my user profile.
When I choose this field to be synched with my list in the Campaign Monitor Synchronisation settings page, I get the following error:
Campaign Monitor synchronization error. Failed to deserialize your request. Please check the documentation and try again.Fields in error: subscriber
I believe this is to do with the format data stored in the custom field in the wp usermeta table. Specifically, the multi-select value is stored as follows (this is with only one value selected)
Is it possible to send multiple values to Campaign Monitor list via your plugin?
If so what format should the custom field store its data, and are there any recommended methods for creating this custom field so that the value store is formatted correctly?