curl --request GET \
  --url https://staging.api.commercengine.io/api/v1/{store_id}/storefront/customers/{user_id}/loyalty \
  --header 'Authorization: Bearer <token>'

{
  "message": "<string>",
  "success": true,
  "content": {
    "loyalty": {
      "membership_number": "<string>",
      "date_of_join": "2023-11-07T05:31:56Z",
      "date_of_assign": "2023-11-07T05:31:56Z",
      "date_of_reset": "2023-11-07T05:31:56Z",
      "current_tier": "<string>",
      "points_earned": 123,
      "points_redeemed": 123,
      "points_balance": 123,
      "total_orders": 123,
      "lifetime_orders": 123,
      "total_spent": 123,
      "lifetime_spent": 123,
      "lifetime_savings": 123
    }
  }
}