> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Member Fields

> Member fields for the MDX On Demand API.

## Member Fields

| Field Name       | Data Type | Description                                                                                                     |
| ---------------- | --------- | --------------------------------------------------------------------------------------------------------------- |
| `guid`           | `String`  | The unique identifier for the member. Defined by MX.                                                            |
| `id`             | `String`  | The unique partner-defined identifier for the member. Cannot begin with `MBR-`. Max Length is 1024.             |
| `institution_id` | `String`  | Client-specific ID used to identify an alternate institution in a create member request. Rarely used.           |
| `is_disabled`    | `Boolean` | Indicates whether a member is disabled. Defaults to false.                                                      |
| `login`          | `String`  | Login credential used with password to authenticate a user in a partner system. Alternative to `userkey`.       |
| `metadata`       | `String`  | Additional information a partner can store on the member.                                                       |
| `name`           | `String`  | Name of the member. Defaults to institution name if omitted. Max Length is 100. Rarely used in create requests. |
| `password`       | `String`  | Password credential used with login to authenticate a user. Alternative to `userkey`.                           |
| `user_guid`      | `String`  | Unique identifier for the user this member belongs to. Defined by MX.                                           |
| `user_id`        | `String`  | Partner-defined identifier for the user this member belongs to.                                                 |
| `userkey`        | `String`  | Preferred authentication credential sent for MDX On Demand aggregation requests. Replaces login/password.       |