You can use the net/http package in Go to send a POST request with headers. Here's an example of how you can do it:

Go: 
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package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
)

func main() {
	url := "https://www.example.com/api/v1/create"
	contentType := "application/json"
	data := []byte(`{"name": "Test User", "email": "test@example.com"}`)

	client := &http.Client{}
	req, err := http.NewRequest("POST", url, bytes.NewBuffer(data))
	if err != nil {
		fmt.Println(err)
		return
	}
	req.Header.Add("Content-Type", contentType)
	req.Header.Add("Authorization", "Bearer YOUR_ACCESS_TOKEN")

	resp, err := client.Do(req)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(string(body))
}

In this example, we create a new HTTP request with the POST method, set the URL to https://www.example.com/api/v1/create, and set the request body to a JSON payload. We also set the Content-Type header to application/json and add an Authorization header with a bearer token. Finally, we use the http.Client to send the request and print the response body.