get https://marketplace.walmartapis.com/v3/ca/shipping/labels/carriers//trackings/
Download a label by carrier and tracking number. The response to a successful call contains the tracking number along with the label in PDF or image format, based on the media type specified in the Accept
header. For example: Accept: application/json,application/pdf
returns a PDF label. Accept: application/json,image/png
returns an image label.