Filter to specific channels by WhatsApp number; repeat for several (?wabaNumber=17042493212&wabaNumber=919999999999, max 50). Accepted with or without a leading +, and with spaces or dashes — the value is reduced to digits before matching. A number that is unknown or not assigned to the caller is left out of the results rather than erroring. When this filter is used, count is omitted from the response. Omit it to list every assigned channel.