You must enter your LOX24 account data in Bitrix24 to link both services:
Sender ID: any phone number in international format (e.g. +1761324454) or a text with up to 11 characters without any special characters (only Latin, e.g. Test Sender).
Service ID: Defines whether you send Pro or Direct. You can find the Service ID in your web account in the dashboard. This value is different for each customer.
Encoding: If you only send SMS with GSM characters, select SMS (https://en.wikipedia.org/wiki/GSM_03.38#GSM_7-bit_default_alphabet_and_extension_table_of_3GPP_TS_23.038_/_GSM_03.38 ). If you need other characters, you must select UTF-8.
Login: Your customer number. You also use it for login at www.lox24.eu/account
Password: This is the API key in V1 and not your account password. You can find it under Settings and API Settings.