post https://marketplace.walmartapis.com/v3/shipping/labels
Create shipping label for items. The response to a successful call are of JSON, PDF, or image type based on the media type passed in Accept header. For example, 'Accept'='application/json,application/pdf' will result in PDF media type and'Accept'='application/json,image/png' as image media type and 'Accept'='application/json' as JSON response.