Update an existing custom field definition
API key for authentication. Use your API key directly without any prefix (e.g., 'your-api-key'). Bearer prefix is optional but not required.
Custom field updated successfully
A custom field definition for a workspace
Unique identifier
Machine-readable field name (auto-generated from label)
Human-readable display label
If true, this field has a preset value for all users
Preset value (only used when is_preset=true)