For adding more than one or two OATH profiles consider using the bulk token import functionality instead (see OathController.GetDataFromCsvFile and OathController.SubmitUploadedFile).
Required fields are (from OathFileSchema.DataEntryField): UserPrincipalName, AccountName, SecretKey, Issuer, Algorithm, Digits, Type, Period, Counter. You must be an OATH admin or system admin to call this API.