WP_Query {
  "meta_query" => {
    "relation" => "OR",
    [
      "key" => "rating",
      "compare" => "LIKE",
      "value" => "AA"
    ]
  },

  "tax_query" => {
    "relation" => "OR",
    [
      "taxonomy" =>"currencies",
      "field" =>"slug",
      "terms" => [
        "eur",
        "usd"
      ],
      "operator" => "IN"
    ]
  }
}