Set or Update Label for Attribute Set

This PUT endpoint sets or updates a human-readable label for a given attr_set_token.<br> Labels help identify the context of the attribute set — for example, assigning a label like "JPMorgan Chase" to represent attributes linked to that specific destination or financial institution.<br> Provide the attr_set_token and endpoint_toke as a path parameter and the desired label in the request body.<br> If a label already exists for the attribute set, it will be overwritten.