get https://{defaultHost}/v1/custom_attrs
List all custom attributes set up on your account that can be used to set candidate profile attributes.
Custom attributes are used to set additional data on candidates in your panel.
For example, you want to know what plan a candidate is on. In this case, we might use a custom attribute {name:'plan', attr_type: 'text'} to store this value.
See the custom attr schema for supported attribute types.