(DataFlex) 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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoHttp
    Variant vReq
    Handle hoReq
    Variant vResp
    Handle hoResp
    Integer iStatusCode
    Handle hoJson
    Boolean iSuccess
    Boolean iSuccess
    String sTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // 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

    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End
    Send ComAddParam To hoReq "grant_type" "refresh_token"
    Send ComAddParam To hoReq "refresh_token" "Aztr|..."
    Send ComAddParam To hoReq "client_id" "foodev"
    Send ComAddParam To hoReq "client_secret" "Y76SDl2F"

    Send ComAddHeader To hoReq "Host" "api.amazon.com"

    Get pvComObject of hoReq to vReq
    Get ComPostUrlEncoded Of hoHttp "https://api.amazon.com/auth/o2/token" vReq To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStatusCode Of hoResp To iStatusCode
    Showln "Status Code = " iStatusCode

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComBodyStr Of hoResp To sTemp1
    Get ComLoad Of hoJson sTemp1 To iSuccess
    Send Destroy of hoResp

    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    If (iStatusCode <> 200) Begin
        Showln "Failed."
        Procedure_Return
    End

    // 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...)
    Get ComWriteFile Of hoJson "qa_data/tokens/sp_api_lwa_token.json" To iSuccess

    Get ComStringOf Of hoJson "access_token" To sTemp1
    Showln "access_token: " sTemp1
    Showln "Success."


End_Procedure