Get user's welcome bonus, if eligible

Example response

{
  "data": {
    "spin_details": {
      "is_available": true,
      "percentage_period_seconds": 3600,
      "prize_pool": [
        {
          "type": "PERCENTAGE",
          "weight": 0.3,
          "prize_data": 44
        }
      ]
    },
    "user_reward_currency": 0.42,
    "value": 0.3,
    "claimed_at": "2021-12-31T23:59:59Z",
    "expires_at": "2021-12-31T23:59:59Z"
  }
}