post https://us.identity.api.liveramp.com/v1/batch/lookup?
Make batch request calls to the Lookup endpoint to match multiple records in one call.
To make a batch request call, make a POST call to "https://us.identity.api.liveramp.com/v1/batch/lookup" and pass in a JSON array of URL strings constructed in the same way as a single transaction call to the Lookup endpoint. Start each string with "/entities/lookup?" and then include the lookup_type and key parameters for each individual request.
You can pass in up to 1000 URL strings in a single batch call.