RE: Walmart Marketplace API

All,

Thanks for the replies.  I finally figured it out - I experienced the SAME issue 4 years ago.

When adding headers using http_xproc() procedure, you MUST ensure you have a CRLF at the end of each header.

I was missing one on the last header I added.  So I'm guessing the server just sits there waiting for the next header until it times out.
(you can't see this in the debug log)

Apologize for wasting your time.

Greg

-----Original Message-----
From: RPG400-L <[email protected]> On Behalf Of Charles Wilt
Sent: Friday, September 19, 2025 3:50 PM
To: RPG programming on IBM i <[email protected]>
Subject: Re: Walmart Marketplace API

IIRC, it automatically uses 80/443 depending on rather or not http/https is
chosen in the URL.

To use a non-standard port, you just append the :port to the URL

Charles

On Fri, Sep 19, 2025 at 1:01 PM Brad Stone <[email protected]> wrote:

> How do you tell what port you're using in HTTPAPI?
>
> On Thu, Sep 18, 2025 at 2:36 PM Greg Wilburn <
> [email protected]> wrote:
>
> > 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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> > Greg Wilburn
> > Director of IT
> > 301.895.3792 ext. 1231
> > --
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Greg Wilburn
Director of IT
301.895.3792 ext. 1231
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