QA analyst position video interview with HackerRank CodePair tool

hello guys,
I have scheduled one video interview for the QA analyst position manual testing with a QA engineer and QA associate. they don’t have my requirements for automation skills that I saw in the job posting. I already cleared the hr round. she didn’t ask me any programming skills-related questions. but now an interview is scheduled with some hacker code pair tool. but why they need this tool during interviews just to write test cases or some other tasks related to programming skills. I am a little bit worried now about how I will crack this interview now. Please guide me guys on how to prepare.