Since you're teaching an online synchronous class, I assume that you are using Zoom. You could take attendance by having your students write their names in the Chat at the beginning of class. Then if you need to verify who stays for the entire class, you could have them write something in the Chat at the end or towards the end of the class.
I also teach online synchronous Zoom classes, and I give weekly quizzes at the end of the class period. So, for example, during the last twenty minutes of the class period, I turn off Zoom. Then the students log into Canvas and take their quizzes. This has worked really well for me.
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