post https://marketplace.walmartapis.com/v3/items/spec
The Get Spec API allows users to retrieve specifications for a specified Product Type or a set of Product Types, with a limit of 20 types per request.
To get the spec, include feedType and version in the Request fields below.
Throttling: This endpoint is throttled at a maximum of 3 transactions per minute (TPM) per seller. For more details on throttling, refer to the Walmart throttling documentation.