3) And regarding the pending remix issue on the remix, it will be pending, but when you check the explorer at explorer.apothem.network, the transaction have been executed
For further actions, you may consider blocking this person and/or reporting abuse
1) Please find the Github where you can find all the code base github.com/XinFinOrg, or you can also check out github.com/XDCFoundation
2) You will have to use XDC3 you can find it at npmjs.com/package/xdc3, or you can find the documentation for ether.js at docs.xdc.community/learn/how-to-ar...
3) And regarding the pending remix issue on the remix, it will be pending, but when you check the explorer at explorer.apothem.network, the transaction have been executed