put https://marketplace.walmartapis.com/v3/price
Updates the promotional price.Sellers can update or delete an existing promotional price as well as set up a new promotional price.To set a new promotional price or update an existing one, set the XML pricing attribute processMode to UPSERT. To delete a promotional price, set the XML pricing attribute processMode to DELETE. To delete all promotions for a SKU, set replaceAll to an empty payload.