Save discount as a shop metafield in Node.js React app

Retired Boards Appdev Graphql Basics And Troubleshooting
2

So after a week of rigorous battle with the code and the API , i finally figured out how to save the discount as a metafield.

I also encountered a lot of errors including 405, 500, 501

I’m sharing the solution here, so that it will helpful for anyone Or some Expert can suggest a better way to do the same.

Client side

const options={headers:{"Content-Type":"application/json"}};

axios.post("/metafield",
          {metafield:{namespace:"shop",key:"discount",value:this.state.discount,value_type:"string"}},options)
          .then(o=>{console.log(o)},o=>{console.log(o)});

Server side

router.post("/metafield", koaBody(), async (ctx) => {
    try {
      const data = JSON.stringify(ctx.request.body);
      const apikey = ctx.cookies.get("accessToken");
      const shop = "xxxxxxxxxxxx.myshopify.com";

      const response = await fetch(
        `https://${shop}/admin/api/2020-04/metafields.json`,
        {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
            "X-Shopify-Access-Token": apikey,
          },
          body: data,
        }
      );
      const responseJson = await response.json();
      ctx.body = responseJson;

    } catch (error) {
      console.log(error);
    }
  });