An arbitrary alphanumeric unique ID, specified by the seller, which identifies each item. Special characters in the sku needing encoding are: ':', '/', '?', '#', '[', ']', '@', '!', '$', '&', ''', '(', ')', '*', '+', ',', ';', '=', ‘ ’, '{', '}' as well as '%' itself if it's a part of sku. Make sure to encode space with %20. Other characters don't need to be encoded.

The access token retrieved in the Token API call

A unique ID to track the consumer request by channel. Use the Consumer Channel Type received during onboarding

A unique ID which identifies each API call and used to track and debug issues; use a random generated GUID for this ID

Walmart Service Name