project_id: The project id in which the specified query is contained. Obtain a list of project IDs using bwr_get_projects().
query_id: The query ID you'd like to see total mentions for. Note that you can only specify a query or a query group, not both.
querygrp_id: The query group ID you'd like to see total mentions for. Note that you can only specify a query or a query group, not both.
filters: (Optional) A list of key-value pairs to filter the mentions query by. Use the bwr_filters_get() function to find out all available filters.
date_range: A character vector containing 2 date values in YYYY-mm-dd format. The first value is the beginning of your desired date range and the second value is the end of the date range.
token: The authentication token, acquired using bwr_auth()
Returns
Returns a numeric vector of length 1 with the results.