url := "https://api.pinata.cloud/pinning/hashMetadata"
payload := strings.NewReader(`{
req, err := http.NewRequest(method, url, payload)
req.Header.Add("Authorization", "Bearer PINATA JWT")
req.Header.Add("Content-Type", "application/json")
res, err := client.Do(req)
body, err := ioutil.ReadAll(res.Body)
fmt.Println(string(body))