(Lianja) 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.

loHttp = createobject("CkHttp")

// 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

loReq = createobject("CkHttpRequest")
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 = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loReq
    return
endif

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

loJson = createobject("CkJsonObject")
loJson.Load(loResp.BodyStr)
release loResp

loJson.EmitCompact = .F.
? loJson.Emit()

if (lnStatusCode <> 200) then
    ? "Failed."
    release loHttp
    release loReq
    release loJson
    return
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...)
llSuccess = loJson.WriteFile("qa_data/tokens/sp_api_lwa_token.json")

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


release loHttp
release loReq
release loJson