url := "https://managed.mypinata.cloud/api/v1/auth/content/jwt"
payload := strings.NewReader(`{
"contentIds": ["95c904a0-4d61-4598-a4c8-fb5f0793c7ab"]
req, err := http.NewRequest(method, url, payload)
req.Header.Add("x-api-key", "SUBMARINE KEY")
req.Header.Add("Content-Type", "application/json")
res, err := client.Do(req)
body, err := ioutil.ReadAll(res.Body)
fmt.Println(string(body))