To get a Walmart API Key follow this 3 easy steps:
1) Go to site https://developer.walmartlabs.com/member
And fill the information to register for one account ( is free )
2)After you register they will send you a confirmation email
Click on the link than copy your key
3)Get into DSHOPIT backoffice , click on YOUR ACCOUNT , than click on API, paste the KEY and click on SUBMIT