google ecommerce tracking setup in laravel8

hello i have made an ecommerce website in laravel and want to set up google ecommerce tracking to my website. but i am very confuse how to do it. first is there any library i need to attach? like i have read docs and they say if you have gtag.js set up. but i could not find link to this js library. does it mean i need to have an account in google tag manager? but i dont want that. and the code that google developer docs provide. i just need to change that to implement ecommerce tracking? can anybody clarify and guide me?

gtag('event', 'purchase', {
  "transaction_id": "24.031608523954162",
  "affiliation": "Google online store",
  "value": 23.07,
  "currency": "USD",
  "tax": 1.24,
  "shipping": 0,
  "items": [
    {
      "id": "P12345",
      "name": "Android Warhol T-Shirt",
      "list_name": "Search Results",
      "brand": "Google",
      "category": "Apparel/T-Shirts",
      "variant": "Black",
      "list_position": 1,
      "quantity": 2,
      "price": "2.0"
    },
    {
      "id": "P67890",
      "name": "Flame challenge TShirt",
      "list_name": "Search Results",
      "brand": "MyBrand",
      "category": "Apparel/T-Shirts",
      "variant": "Red",
      "list_position": 2,
      "quantity": 1,
      "price": "3.0"
    }
  ]
});