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 <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Greg
Wilburn
Sent: Tuesday, September 16, 2025 8:31 AM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
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 <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Jon
Paris
Sent: Monday, September 15, 2025 6:43 PM
To: RPG programming on the IBM i (AS/400 and iSeries) <
rpg400-l@xxxxxxxxxxxxxxxxxx>
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
Jon.Paris@xxxxxxxxxxxxxx

On Sep 15, 2025, at 5:02 PM, Greg Wilburn <

gwilburn@xxxxxxxxxxxxxxxxxxxxxxx> 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
gwilburn@xxxxxxxxxxxxxxxxxxxxxxx<mailto:gwilburn@xxxxxxxxxxxxxxxxxxxxxxx

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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questions.