Add a default owner for an integrator.

{
  "message": "Successfully added a new default owner for the integrator.",
  "resource": "integrator-defaults",
  "data": {
    "integrator": "019e16f3-9624-7477-bbd0-58e60e65a0f2",
    "has-owner": true,
    "owner": "019e16f3-9625-7ca7-9085-16fe50f19915",
    "dev-defaults": null,
    "prod-defaults": null
  }
}

{
  "message": "No existing organization member was not found when adding default owner.",
  "errors": []
}

{
  "message": "You have to be authorized to access this resource."
}

{
  "message": "Access denied for user."
}