B4X

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) B4X

Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")

'  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

Dim req As ChilkatHttpRequest
req.Initialize
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")

req.HttpVerb = "POST"
req.ContentType = "application/x-www-form-urlencoded"

Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpReq("https://api.amazon.com/auth/o2/token", req, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Dim statusCode As Int = resp.StatusCode
Log("Status Code = " & statusCode)

Dim json As ChilkatJsonObject
json.Initialize
json.Load(resp.BodyStr)

json.EmitCompact = False
Log(json.Emit)

If statusCode <> 200 Then
    Log("Failed.")
    Return
End If


'  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")

Log("access_token: " & json.StringOf("access_token"))
Log("Success.")