post https://api.tcgplayer.com/stores//buylist/skus/batch
Perform multiple buylist updates asynchronously in a batch. The response will
contain a single GUID to identify the batch. All buylist updates are applied
to the buylist of the seller indicated by the bearer token used to make this
request. When the batch has been processed, a message will be sent to your
application's web hook containing the GUID from this response.