Get a joint account holder's details

Example response

{
  "accountHolderUid": "aabbaabb-aabb-aabb-aabb-aabbaabbaabb",
  "personOne": {
    "title": "Mr",
    "firstName": "Dave",
    "lastName": "Bowman",
    "dateOfBirth": "1968-04-02",
    "email": "dave.bowman@example.com",
    "phone": "+447700900123"
  },
  "personTwo": {
    "title": "Mr",
    "firstName": "Dave",
    "lastName": "Bowman",
    "dateOfBirth": "1968-04-02",
    "email": "dave.bowman@example.com",
    "phone": "+447700900123"
  }
}