(Visual FoxPro) 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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL loReq
LOCAL loResp
LOCAL lnStatusCode
LOCAL loJson
LOCAL lnSuccess

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')
loReq.AddParam("grant_type","refresh_token")
loReq.AddParam("refresh_token","Aztr|...")
loReq.AddParam("client_id","foodev")
loReq.AddParam("client_secret","Y76SDl2F")

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

loResp = loHttp.PostUrlEncoded("https://api.amazon.com/auth/o2/token",loReq)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    RELEASE loReq
    CANCEL
ENDIF

lnStatusCode = loResp.StatusCode
? "Status Code = " + STR(lnStatusCode)

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(loResp.BodyStr)
RELEASE loResp

loJson.EmitCompact = 0
? loJson.Emit()

IF (lnStatusCode <> 200) THEN
    ? "Failed."
    RELEASE loHttp
    RELEASE loReq
    RELEASE loJson
    CANCEL
ENDIF

* 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...)
lnSuccess = loJson.WriteFile("qa_data/tokens/sp_api_lwa_token.json")

? "access_token: " + loJson.StringOf("access_token")
? "Success."

RELEASE loHttp
RELEASE loReq
RELEASE loJson