post https://api.unloc.app/integrators/v1/lock-holders/format-phone-number/
Returns the Mobile Phone Number you provide in the request formatted to the E.164 standard. Internally this endpoint uses Google's libphonenumber library and some custom formatting, so if performance is an issue we recommend using the library rather than this endpoint. Note that this formatter is best-effort, so it may not correctly format 100% of incoming phone numbers.