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Details on ReportBillableEvent request.
The id of the billable event. Subject to the following restrictions: 1. IDs must be valid Unicode strings. 2. IDs are limited to a maximum length of 64 characters. 3. IDs must be normalized according to Unicode Normalization Form C (http://www.unicode.org/reports/tr15/ ). 4. IDs must not contain any of the following ASCII characters: '/', ':', '?', ',', or '#'.
Two-letter region code of the country or region where the event takes place. A list of valid region codes can be found here: https://developers.google.com/maps/coverage
The identifiers that are directly related to the event being reported. The customer defines the meaning of these IDs.