(Go) Amazon SP-API Request an LWA access token

See more Amazon SP-API Examples

Request an LWA access token, make a secure HTTP POST to the LWA authentication server (https://api.amazon.com/auth/o2/token)

For more information, see https://developer-docs.amazon.com/sp-api/docs/connecting-to-the-selling-partner-api

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    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    http := chilkat.NewHttp()

    // Implements the following CURL command:

    // curl -X POST https://example.com/auth/o2/token \
    //   -H "Host: api.amazon.com" \
    //   -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" \
    //   -d "grant_type=refresh_token" \
    //   -d "refresh_token=Aztr|..." \
    //   -d "client_id=foodev" \
    //   -d "client_secret=Y76SDl2F"

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    req := chilkat.NewHttpRequest()
    req.AddParam("grant_type","refresh_token")
    req.AddParam("refresh_token","Aztr|...")
    req.AddParam("client_id","foodev")
    req.AddParam("client_secret","Y76SDl2F")

    req.AddHeader("Host","api.amazon.com")

    resp := http.PostUrlEncoded("https://api.amazon.com/auth/o2/token",req)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        req.DisposeHttpRequest()
        return
    }

    statusCode := resp.StatusCode()
    fmt.Println("Status Code = ", statusCode)

    json := chilkat.NewJsonObject()
    json.Load(resp.BodyStr())
    resp.DisposeHttpResponse()

    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    if statusCode != 200 {
        fmt.Println("Failed.")
        http.DisposeHttp()
        req.DisposeHttpRequest()
        json.DisposeJsonObject()
        return
    }

    // Success returns this JSON:

    // {
    //   "access_token": "Atza|...",
    //   "refresh_token": "Atzr|...",
    //   "token_type": "bearer",
    //   "expires_in": 3600
    // }

    // Save the JSON token to a file for use in subsequent calls.
    // (this example is passing a relative file path.  You don't need to save to a file
    // if, for example, you keep the access token in-memory for subsequent use...)
    success := json.WriteFile("qa_data/tokens/sp_api_lwa_token.json")

    fmt.Println("access_token: ", *json.StringOf("access_token"))
    fmt.Println("Success.")

    http.DisposeHttp()
    req.DisposeHttpRequest()
    json.DisposeJsonObject()