RE: Walmart Marketplace API

So I am still struggling here... I am able to connect to this API and receive an Access Token using Postman.  However, I cannot seem to connect successfully from a simple RPG pgm using HTTPAPI (something I use all the time).

I've even compared the HTTP request in Postman to the HTTPAPI debug file.  I even compared the Base64 encoded "Authorization" in Notepad++.

Differences:
1. Postman has a "cookie"
2. Headers are in a different order

Any ideas?  I'm at a complete loss.

Postman HTTP (successful):
POST /v3/token HTTP/1.1
Host: marketplace.walmartapis.com
WM_SVC.NAME: Walmart Marketplace
Accept: application/json
User-Agent: http-api/1.43
Content-Type: application/x-www-form-urlencoded
Authorization: Basic YTJlZTE.....
Cookie: ak_bmsc=.......p4aGV/sU=~1
Content-Length: 29

grant_type=client_credentials


HTTPAPI (unsuccessful):
POST /v3/token HTTP/1.1
Host: marketplace.walmartapis.com
User-Agent: http-api/1.43
Content-Type: application/x-www-form-urlencoded
Content-Length: 29
Authorization: Basic YTJlZTE...
WM_SVC.NAME: Walmart Marketplace
Accept: application/json

senddoc(): entered
grant_type=client_credentials
recvresp(): entered
SetError() #44: CommTCP_read: Socket has been shut down.
recvresp(): end with err
http_close(): entered




-----Original Message-----
From: RPG400-L <[email protected]> On Behalf Of Greg Wilburn
Sent: Tuesday, September 16, 2025 8:31 AM
To: RPG programming on IBM i <[email protected]>
Subject: RE: Walmart Marketplace API

Sure...

The clientId and clientSecret are set above this code.  I am trying to get an Access Token.


    rc = http_setauth(HTTP_AUTH_BASIC :clientID  :clientSecret);

// Get an Access Token
    http_debug(*on :FLDR + '/' + inCom + '/http_debug.txt');

    URL = 'https://marketplace.walmartapis.com/v3/token';
    method = 'POST';
    form = WebForm_open();
    WebForm_setVar(form :'grant_type' :'client_credentials');
    body = WebForm_getData(form);
    WebForm_close(form);

    Response = FLDR + '/' + inCom + '/token_response.json';

    Exec Sql set :uuid = generate_uuid();
    Ifs_WriteToFile(logFd:'UUID: ' + uuId);
    headerVars.partnerId = '10001667921';
    headerVars.uniqueId = uuId;
    headerVars.serviceName = 'Walmart Marketplace';
    headerVars.acceptType = 'application/json';

    rc = http_xproc( HTTP_POINT_ADDL_HEADER
                   : %paddr(addHttpHeaders)
                   : %addr(headerVars));

    rc = http_req( method
                 : URL
                 : response
                 : *omit
                 : *omit
                 : body
                 : 'application/x-www-form-urlencoded');



-----Original Message-----
From: RPG400-L <[email protected]> On Behalf Of Jon Paris
Sent: Monday, September 15, 2025 6:43 PM
To: RPG programming on the IBM i (AS/400 and iSeries) <[email protected]>
Subject: Re: Walmart Marketplace API

Wanna share a code snippet so we can see what you are requesting.  I played with this API a while back and had no issues.  Nothing special that I can recall.


Jon Paris
[email protected]



> On Sep 15, 2025, at 5:02 PM, Greg Wilburn <[email protected]> wrote:
>
> Just wondering if anyone has implemented this?
>
> Having issues just getting a token using HTTPAPI... the debug log shows an "unknown protocol" error.  I'm not sure that I've noticed that before.
>
> Any insight would be appreciated.
>
> SetError() #49: SSL_protocol: Unknown protocol 5000
> Protocol Used:
> http_persist_req(POST) entered.
> http_long_ParseURL(): entered
> http_long_ParseURL(): entered
> do_oper(POST): entered
> There are 0 cookies in the cache
> POST /v3/token HTTP/1.1
> Host: marketplace.walmartapis.com
> User-Agent: http-api/1.43
> Content-Type: application/x-www-form-urlencoded
> Content-Length: 29
> Authorization: Basic  - DELETED -
> WM_PARTNER.ID: 10001667921
> WM_QOS.CORRELATION_ID: 82B37F6E-C4A5-4675-AA4B-AC14A2CD33B7
> WM_SVC.NAME: Walmart Marketplace
> Accept: application/json
>
> senddoc(): entered
> grant_type=client_credentials
> recvresp(): entered
> SetError() #44: CommTCP_read: Socket has been shut down.
> recvresp(): end with err
> http_close(): entered
> [Logo]<https://www.totalbizfulfillment.com/>    Greg Wilburn
> Director of IT
> 301.895.3792 ext. 1231
> 301.895.3895 direct
> [email protected]<mailto:[email protected]>
> 1 Corporate Dr
> Grantsville, MD 21536
> www.totalbizfulfillment.com<http://www.totalbizfulfillment.com>
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Greg Wilburn
Director of IT
301.895.3792 ext. 1231
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Please contact [email protected] for any subscription related questions.




Greg Wilburn
Director of IT
301.895.3792 ext. 1231
-- 
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Please contact [email protected] for any subscription related questions.