Rostislav,
in Boxing it is possible to induce a bot only for Viber.
application of recommendations on how to automatically fill in the client number:
1) in the integration here
https://prnt.sc/xlk7rp add "Add button" and select Action type - Share phone like this
https://prnt.sc/w78xn12) then in the viber dialog there is an additional option, where you can select that dialog:
https://prnt.sc/w79ol13) work in the process field, in which it is necessary to write down the client's phone number
4) put the "Write the value in the additional field" dialog, for example, on the procedure, so that you should always save it - and in the dialog, write the value [phoneNumberViber] like this
https://prnt.sc/w79w2uand the phone number is entered in the process subfield, and then you can enter it in the client's phone field and find out what it is.