curl -i 'https://vestibule.mx.com/users/{user_guid}/members/{member_guid}/credentials' \  -H 'Accept: application/vnd.mx.atrium.v1+json' \  -H 'MX-API-Key: {mx_api_key}' \  -H 'MX-Client-ID: {mx_client_id}'

{
  "credentials": [
    {
      "display_order": 0,
      "field_name": "login_email",
      "guid": "CRD-12ce94ad-032b-5441-8cb3-d7ebe3a35676",
      "label": "Email Address",
      "type": "LOGIN"
    },
    {
      "display_order": 1,
      "field_name": "login_password",
      "guid": "CRD-305767e4-f464-765b-8f83-881b5bd307ec",
      "label": "PayPal password",
      "type": "PASSWORD"
    }
  ]
}